diff --git a/barra.edn b/barra.edn
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index 0000000..47f7848
--- /dev/null
+++ b/barra.edn
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/project.clj b/project.clj
index f0c807f..07019d0 100644
--- a/project.clj
+++ b/project.clj
@@ -1,13 +1,15 @@
-(defproject mw-desktop "0.1.0-SNAPSHOT"
+(defproject mw-desktop "0.3.0-SNAPSHOT"
   :description "FIXME: write description"
   :url "http://example.com/FIXME"
   :license {:name "EPL-2.0 OR GPL-2.0-or-later WITH Classpath-exception-2.0"
             :url "https://www.eclipse.org/legal/epl-2.0/"}
   :dependencies [[cljfx "1.7.23"]
+                 [com.novemberain/pantomime "2.11.0"]
+                 [com.taoensso/timbre "6.2.2"]
                  [de.codecentric.centerdevice/javafxsvg "1.3.0"] ;; used by markdown-editor-example
                  [markdown-clj "1.11.4"]
-                 [mw-engine "0.2.0-SNAPSHOT"]
-                 [mw-parser "0.2.0-SNAPSHOT"]
+                 [mw-engine "0.3.0-SNAPSHOT"]
+                 [mw-parser "0.3.0-SNAPSHOT"]
                  [net.sourceforge.htmlcleaner/htmlcleaner "2.29"]
                  [org.clojure/clojure "1.10.3"]
                  [org.clojure/core.cache "1.0.225"]
diff --git a/resources/tiles/life/black.png b/resources/tilesets/life/black.png
similarity index 100%
rename from resources/tiles/life/black.png
rename to resources/tilesets/life/black.png
diff --git a/resources/tiles/life/red.png b/resources/tilesets/life/red.png
similarity index 100%
rename from resources/tiles/life/red.png
rename to resources/tilesets/life/red.png
diff --git a/resources/tiles/life/white.png b/resources/tilesets/life/white.png
similarity index 100%
rename from resources/tiles/life/white.png
rename to resources/tilesets/life/white.png
diff --git a/resources/tiles/world/abandoned.png b/resources/tilesets/world/abandoned.png
similarity index 100%
rename from resources/tiles/world/abandoned.png
rename to resources/tilesets/world/abandoned.png
diff --git a/resources/tiles/world/camp.png b/resources/tilesets/world/camp.png
similarity index 100%
rename from resources/tiles/world/camp.png
rename to resources/tilesets/world/camp.png
diff --git a/resources/tiles/world/climax.png b/resources/tilesets/world/climax.png
similarity index 100%
rename from resources/tiles/world/climax.png
rename to resources/tilesets/world/climax.png
diff --git a/resources/tiles/world/crop.png b/resources/tilesets/world/crop.png
similarity index 100%
rename from resources/tiles/world/crop.png
rename to resources/tilesets/world/crop.png
diff --git a/resources/tiles/world/error.png b/resources/tilesets/world/error.png
similarity index 100%
rename from resources/tiles/world/error.png
rename to resources/tilesets/world/error.png
diff --git a/resources/tiles/world/fire.png b/resources/tilesets/world/fire.png
similarity index 100%
rename from resources/tiles/world/fire.png
rename to resources/tilesets/world/fire.png
diff --git a/resources/tiles/world/forest.png b/resources/tilesets/world/forest.png
similarity index 100%
rename from resources/tiles/world/forest.png
rename to resources/tilesets/world/forest.png
diff --git a/resources/tiles/world/grassland.png b/resources/tilesets/world/grassland.png
similarity index 100%
rename from resources/tiles/world/grassland.png
rename to resources/tilesets/world/grassland.png
diff --git a/resources/tiles/world/harbour.png b/resources/tilesets/world/harbour.png
similarity index 100%
rename from resources/tiles/world/harbour.png
rename to resources/tilesets/world/harbour.png
diff --git a/resources/tiles/world/heath.png b/resources/tilesets/world/heath.png
similarity index 100%
rename from resources/tiles/world/heath.png
rename to resources/tilesets/world/heath.png
diff --git a/resources/tiles/world/house.png b/resources/tilesets/world/house.png
similarity index 100%
rename from resources/tiles/world/house.png
rename to resources/tilesets/world/house.png
diff --git a/resources/tiles/world/ice.png b/resources/tilesets/world/ice.png
similarity index 100%
rename from resources/tiles/world/ice.png
rename to resources/tilesets/world/ice.png
diff --git a/resources/tiles/world/inn.png b/resources/tilesets/world/inn.png
similarity index 100%
rename from resources/tiles/world/inn.png
rename to resources/tilesets/world/inn.png
diff --git a/resources/tiles/world/market.png b/resources/tilesets/world/market.png
similarity index 100%
rename from resources/tiles/world/market.png
rename to resources/tilesets/world/market.png
diff --git a/resources/tiles/world/meadow.png b/resources/tilesets/world/meadow.png
similarity index 100%
rename from resources/tiles/world/meadow.png
rename to resources/tilesets/world/meadow.png
diff --git a/resources/tiles/world/navigable.png b/resources/tilesets/world/navigable.png
similarity index 100%
rename from resources/tiles/world/navigable.png
rename to resources/tilesets/world/navigable.png
diff --git a/resources/tiles/world/pasture.png b/resources/tilesets/world/pasture.png
similarity index 100%
rename from resources/tiles/world/pasture.png
rename to resources/tilesets/world/pasture.png
diff --git a/resources/tiles/world/plague.png b/resources/tilesets/world/plague.png
similarity index 100%
rename from resources/tiles/world/plague.png
rename to resources/tilesets/world/plague.png
diff --git a/resources/tiles/world/ploughland.png b/resources/tilesets/world/ploughland.png
similarity index 100%
rename from resources/tiles/world/ploughland.png
rename to resources/tilesets/world/ploughland.png
diff --git a/resources/tiles/world/river.png b/resources/tilesets/world/river.png
similarity index 100%
rename from resources/tiles/world/river.png
rename to resources/tilesets/world/river.png
diff --git a/resources/tiles/world/scrub.png b/resources/tilesets/world/scrub.png
similarity index 100%
rename from resources/tiles/world/scrub.png
rename to resources/tilesets/world/scrub.png
diff --git a/resources/tiles/world/sea.png b/resources/tilesets/world/sea.png
similarity index 100%
rename from resources/tiles/world/sea.png
rename to resources/tilesets/world/sea.png
diff --git a/resources/tiles/world/snow.png b/resources/tilesets/world/snow.png
similarity index 100%
rename from resources/tiles/world/snow.png
rename to resources/tilesets/world/snow.png
diff --git a/resources/tiles/world/waste.png b/resources/tilesets/world/waste.png
similarity index 100%
rename from resources/tiles/world/waste.png
rename to resources/tilesets/world/waste.png
diff --git a/resources/tiles/world/water.png b/resources/tilesets/world/water.png
similarity index 100%
rename from resources/tiles/world/water.png
rename to resources/tilesets/world/water.png
diff --git a/src/e07_extra_props.clj b/src/e07_extra_props.clj
new file mode 100644
index 0000000..4dbf410
--- /dev/null
+++ b/src/e07_extra_props.clj
@@ -0,0 +1,229 @@
+(ns e07-extra-props
+  (:require [cljfx.api :as fx]))
+
+(def anchor-pane
+  {:fx/type :anchor-pane
+   :children [{:fx/type :label
+               :anchor-pane/left 10
+               :anchor-pane/bottom 10
+               :text "bottom-left"}
+              {:fx/type :label
+               :anchor-pane/top 10
+               :anchor-pane/right 10
+               :text "top-right"}
+              {:fx/type :label
+               :anchor-pane/left 100
+               :anchor-pane/top 100
+               :anchor-pane/right 100
+               :anchor-pane/bottom 100
+               :style {:-fx-background-color :lightgray
+                       :-fx-alignment :center}
+               :text "Try resizing window too!"}]})
+
+(def border-pane
+  {:fx/type :border-pane
+   :top {:fx/type :label
+         :border-pane/alignment :center
+         :border-pane/margin 10
+         :text "top header"}
+   :left {:fx/type :label
+          :border-pane/margin 10
+          :text "left sidebar"}
+   :right {:fx/type :label
+           :border-pane/margin 10
+           :text "right sidebar"}
+   :center {:fx/type :label
+            :border-pane/margin 10
+            :text "center content"}
+   :bottom {:fx/type :label
+            :border-pane/margin 10
+            :text "bottom footer"}})
+
+(def flow-pane
+  {:fx/type :flow-pane
+   :vgap 5
+   :hgap 5
+   :padding 5
+   :children (repeat 100 {:fx/type :rectangle :width 25 :height 25})})
+
+(def grid-pane
+  {:fx/type :grid-pane
+   :children (concat
+               (for [i (range 16)]
+                 {:fx/type :label
+                  :grid-pane/column i
+                  :grid-pane/row i
+                  :grid-pane/hgrow :always
+                  :grid-pane/vgrow :always
+                  :text "boop"})
+               [{:fx/type :label
+                 :grid-pane/row 2
+                 :grid-pane/column 3
+                 :grid-pane/column-span 2
+                 :text "I am a long label spanning 2 columns"}])})
+
+(def h-box
+  {:fx/type :h-box
+   :spacing 5
+   :children [{:fx/type :label
+               :text "just label"}
+              {:fx/type :label
+               :h-box/hgrow :always
+               :max-width Double/MAX_VALUE
+               :style {:-fx-background-color :lightgray}
+               :text "expanded label"}
+              {:fx/type :label
+               :h-box/margin 100
+               :text "label with big margin"}]})
+
+(def stack-pane
+  {:fx/type :stack-pane
+   :children [{:fx/type :rectangle
+               :width 200
+               :height 200
+               :fill :lightgray}
+              {:fx/type :label
+               :stack-pane/alignment :bottom-left
+               :stack-pane/margin 5
+               :text "stacked label"}
+              {:fx/type :text-field
+               :stack-pane/alignment :top-right
+               :stack-pane/margin 5
+               :max-width 300
+               :text "Text field in top-right corner"}]})
+
+(defn- tile-image [{:keys [url]}]
+  {:fx/type :image-view
+   :image {:url url
+           :requested-width 310
+           :preserve-ratio true
+           :background-loading true}})
+
+(def tile-pane
+  {:fx/type :scroll-pane
+   :fit-to-width false
+   :content {:fx/type :tile-pane
+             :pref-columns 3
+             :hgap 5
+             :vgap 5
+             :children [{:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.imgur.com/oy91jyx.gif"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.imgur.com/B4DdoER.png"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.imgur.com/mQOeSe5.png"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.redd.it/6906qzxo55711.png"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.redd.it/810g0l3sgis01.gif"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.redd.it/rpkzzc0awr411.gif"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "http://i.imgur.com/G3dVZpk.jpg"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.redd.it/k4hax2x5yyhy.png"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.imgur.com/PRxRkne.png"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.redd.it/zusrb3sxsz211.gif"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.redd.it/fagm2fhxv1yz.gif"}
+                        {:fx/type tile-image
+                         :tile-pane/alignment :bottom-center
+                         :url "https://i.redd.it/w49wc60kys401.gif"}]}})
+
+(def v-box
+  {:fx/type :v-box
+   :spacing 5
+   :fill-width true
+   :alignment :top-center
+   :children [{:fx/type :label :text "just label"}
+              {:fx/type :label
+               :v-box/vgrow :always
+               :style {:-fx-background-color :lightgray}
+               :max-height Double/MAX_VALUE
+               :max-width Double/MAX_VALUE
+               :text "expanded label"}]})
+
+(def button-bar
+  {:fx/type :button-bar
+   :button-min-width 100
+   :buttons [{:fx/type :button
+              :button-bar/button-data :yes
+              :text "Yes"}
+             {:fx/type :button
+              :button-bar/button-data :no
+              :text "No"}]})
+
+(def split-pane
+  {:fx/type :split-pane
+   :divider-positions [0.5]
+   :items [{:fx/type :label
+            :split-pane/resizable-with-parent false
+            :padding 50
+            :text "This is label that is NOT resizable with parent"}
+           {:fx/type :label
+            :padding 50
+            :text "This is a label resizable with parent"}]})
+
+
+(fx/on-fx-thread
+  (fx/create-component
+    {:fx/type :stage
+     :showing true
+     :title "Pane examples"
+     :scene {:fx/type :scene
+             :root {:fx/type :tab-pane
+                    :pref-width 960
+                    :pref-height 540
+                    :tabs [{:fx/type :tab
+                            :text "Anchor Pane"
+                            :closable false
+                            :content anchor-pane}
+                           {:fx/type :tab
+                            :text "Border Pane"
+                            :closable false
+                            :content border-pane}
+                           {:fx/type :tab
+                            :text "Flow Pane"
+                            :closable false
+                            :content flow-pane}
+                           {:fx/type :tab
+                            :text "Grid Pane"
+                            :closable false
+                            :content grid-pane}
+                           {:fx/type :tab
+                            :text "HBox"
+                            :closable false
+                            :content h-box}
+                           {:fx/type :tab
+                            :text "Stack Pane"
+                            :closable false
+                            :content stack-pane}
+                           {:fx/type :tab
+                            :text "Tile Pane"
+                            :closable false
+                            :content tile-pane}
+                           {:fx/type :tab
+                            :text "VBox"
+                            :closable false
+                            :content v-box}
+                           {:fx/type :tab
+                            :text "Button Bar"
+                            :closable false
+                            :content button-bar}
+                           {:fx/type :tab
+                            :text "SplitPane"
+                            :closable false
+                            :content split-pane}]}}}))
diff --git a/src/mw_desktop/core.clj b/src/mw_desktop/core.clj
index 5dea61b..5871ab8 100644
--- a/src/mw_desktop/core.clj
+++ b/src/mw_desktop/core.clj
@@ -1,31 +1,56 @@
 (ns mw-desktop.core
-  (:require [clojure.java.io :refer [file]]
-            [clojure.tools.cli :refer [parse-opts]])
+  (:require [clojure.string :refer [join]]
+            [clojure.tools.cli :refer [parse-opts]]
+            ;; [mw-desktop.fxui :refer [ui]]
+            [mw-desktop.io :refer [load-ruleset! load-world!]])
   (:gen-class))
 
+(def defaults
+  "Defaults for command line arguments."
+  {:ruleset "rulesets/basic.txt"
+   :tileset "tilesets/world/"
+   :world "heightmaps/small_hill.png"})
+
 (def cli-options
-  [["-f FILEPATH" "--file-path FILEPATH"
-    "Set the path to the directory for reading and writing Lisp files."
-    :validate [#(and (.exists (file %))
-                     (.isDirectory (file %))
-                     (.canRead (file %))
-                     (.canWrite (file %)))
-               "File path must exist and must be a directory."]]
-   ["-h" "--help"]
-   ["-p PROMPT" "--prompt PROMPT" "Set the REPL prompt to PROMPT"
-    :default "Sprecan::"]
-   ["-r SYSOUTFILE" "--read SYSOUTFILE" "Read Lisp system from file SYSOUTFILE"
-    :validate [#(and
-                 (.exists (file %))
-                 (.canRead (file %)))
-               "Could not find sysout file"]]
-   ["-s" "--strict" "Strictly interpret the Lisp 1.5 language, without extensions."]
-   ["-t" "--time" "Time evaluations."]
-   ["-x" "--testing" "Disable the jline reader - useful when piping input."]])
+  [["-h" "--help"]
+   ["-r FILEPATH" "--ruleset FILEPATH" "The ruleset to load"]
+   ["-t FILEPATH" "--tileset FILEPATH" "The tileset to load"]
+   ["-w FILEPATH" "--world FILEPATH" "Choose the world to load"]])
+
+(defn error-msg [errors]
+  (str "The following errors occurred while parsing your command:\n\n"
+       (join \newline errors)))
+
+(defn validate-args
+  "Validate command line arguments. Either return a map indicating the program
+  should exit (with an error message, and optional ok status), or a map
+  indicating the action the program should take and the options provided."
+  [args]
+  (let [{:keys [options arguments errors summary]} (parse-opts args cli-options)]
+    (cond
+      (:help options) ; help => exit OK with usage summary
+      {:exit-message (:summary args) :ok? true}
+      errors ; errors => exit with description of errors
+      {:exit-message (error-msg errors)}
+      ;; custom validation on arguments
+      (and (= 1 (count arguments))
+           (#{"start" "stop" "status"} (first arguments)))
+      {:action (first arguments) :options options}
+      :else ; failed custom validation => exit with usage summary
+      {:exit-message (:summary args)})))
 
 (defn -main
   "Parse options, print the banner, read the init file if any, and enter the
   read/eval/print loop."
-[& opts]
-(let [args (parse-opts opts cli-options)]
-  (println "Hello, World!")))
+  [& opts]
+  (let [args (parse-opts opts cli-options)
+        options (merge defaults (:options args))]
+    
+    (load-ruleset! (:ruleset options))
+    (load-tileset! (:tileset options))
+    (load-world! (:world options))
+    
+    (when (:help args) (println (:summary args)) (System/exit 0))
+    ;;(ui options)
+    (println options)
+    ))
diff --git a/src/mw_desktop/e12_interactive_development.clj b/src/mw_desktop/e12_interactive_development.clj
deleted file mode 100644
index a64a55c..0000000
--- a/src/mw_desktop/e12_interactive_development.clj
+++ /dev/null
@@ -1,252 +0,0 @@
-
-;; this file is cribbed entirely from 
-;; https://github.com/cljfx/cljfx/blob/master/examples/e12_interactive_development.clj
-
-;; This file is supposed to be explored from the REPL, evaluating forms one
-;; by one from top to bottom.
-
-(ns e12-interactive-development
-  (:require [cljfx.api :as fx]))
-
-;; I want to build an interactive chart that shows how bouncing object falls
-;; on the ground. I want to be able to edit gravity and friction to see how
-;; it affects object's behavior, so I will put it into state:
-
-(def *state
-  (atom {:gravity 10
-         :friction 0.4}))
-
-
-;; I want to have map event handlers extensible during runtime to avoid full app
-;; restarts. One way is using vars instead of functions to get that kind of
-;; behavior, but I'll go with another way: multi-methods.
-
-(defmulti event-handler :event/type)
-
-;; Now we'll create our app with dummy root view
-
-(defn root-view [{{:keys [gravity friction]} :state}]
-  {:fx/type :stage
-   :showing true
-   :scene {:fx/type :scene
-           :root {:fx/type :h-box
-                  :children [{:fx/type :label
-                              :text (str "g = " gravity ", f = " friction)}]}}})
-
-(def renderer
-  (fx/create-renderer
-    :middleware (fx/wrap-map-desc (fn [state]
-                                    {:fx/type root-view
-                                     :state state}))
-    :opts {:fx.opt/map-event-handler event-handler}))
-
-(fx/mount-renderer *state renderer)
-
-;; At this point, really tiny window appears that displays current gravity and
-;; friction. We want to have an ability to change these values, so let's create
-;; some slider views for them:
-
-(defn slider-view [{:keys [min max value]}]
-  {:fx/type :slider
-   :min min
-   :max max
-   :value value})
-
-;; Now we will update our root view to display these sliders:
-
-(defn root-view [{{:keys [gravity friction]} :state}]
-  {:fx/type :stage
-   :showing true
-   :scene {:fx/type :scene
-           :root {:fx/type :h-box
-                  :children [{:fx/type slider-view
-                              :min 0
-                              :max 100
-                              :value gravity}
-                             {:fx/type slider-view
-                              :min 0
-                              :max 1
-                              :value friction}]}}})
-
-;; Now we updated our root function, but window didn't change. It happens
-;; because cljfx has no way to know if definition of some component functions is
-;; changed. But we can ask renderer to refresh itself by calling it without any
-;; arguments:
-
-(renderer)
-;; Now small label got replaced with 2 sliders. Problem is, there are no labels
-;; on them, so users can't really see what these sliders mean, so let's fix it:
-
-(defn slider-view [{:keys [min max value label]}]
-  {:fx/type :v-box
-   :children [{:fx/type :label
-               :text label}
-              {:fx/type :slider
-               :min min
-               :max max
-               :value value
-               :major-tick-unit max
-               :show-tick-labels true}]})
-
-(defn root-view [{{:keys [gravity friction]} :state}]
-  {:fx/type :stage
-   :showing true
-   :scene {:fx/type :scene
-           :root {:fx/type :h-box
-                  :spacing 10
-                  :children [{:fx/type slider-view
-                              :min 0
-                              :max 100
-                              :value gravity
-                              :label "Gravity"}
-                             {:fx/type slider-view
-                              :min 0
-                              :max 1
-                              :label "Friction"
-                              :value friction}]}}})
-
-(renderer)
-
-
-;; Great, time to add a chart that uses gravity and friction, but first let's
-;; try to display something dummy to make sure it works
-
-(defn chart-view [{:keys [gravity friction]}]
-  {:fx/type :line-chart
-   :x-axis {:fx/type :number-axis
-            :label "Time"}
-   :y-axis {:fx/type :number-axis
-            :label "Y"}
-   :data [{:fx/type :xy-chart-series
-           :name "Position by time"
-           :data (for [t (range 100)]
-                   {:fx/type :xy-chart-data
-                    :x-value t
-                    :y-value t})}]})
-
-(defn root-view [{{:keys [gravity friction]} :state}]
-  {:fx/type :stage
-   :showing true
-   :scene {:fx/type :scene
-           :root {:fx/type :v-box
-                  :spacing 20
-                  :children [{:fx/type chart-view
-                              :gravity gravity
-                              :friction friction}
-                             {:fx/type :h-box
-                              :spacing 10
-                              :alignment :center
-                              :children [{:fx/type slider-view
-                                          :min 0
-                                          :max 100
-                                          :value gravity
-                                          :label "Gravity"}
-                                         {:fx/type slider-view
-                                          :min 0
-                                          :max 1
-                                          :label "Friction"
-                                          :value friction}]}]}}})
-
-(renderer)
-
-;; Now chart is added to a window. Everything looks fine, time to do some
-;; simulation:
-
-(defn simulate-step [{:keys [velocity y]} gravity friction]
-  (let [new-velocity (* (- velocity gravity) (- 1 friction))
-        new-y (+ y new-velocity)]
-    (if (neg? new-y)
-      {:velocity (- new-velocity) :y 0}
-      {:velocity new-velocity :y new-y})))
-
-(defn chart-view [{:keys [gravity friction]}]
-  {:fx/type :line-chart
-   :x-axis {:fx/type :number-axis
-            :label "Time"}
-   :y-axis {:fx/type :number-axis
-            :label "Y"}
-   :data [{:fx/type :xy-chart-series
-           :name "Position by time"
-           :data (->> {:velocity 0 :y 100}
-                      (iterate #(simulate-step % gravity friction))
-                      (take 100)
-                      (map-indexed (fn [index {:keys [y]}]
-                                     {:fx/type :xy-chart-data
-                                      :x-value index
-                                      :y-value y})))}]})
-
-(renderer)
-
-(defmethod event-handler ::set-friction [e]
-  (swap! *state assoc :friction (:fx/event e)))
-
-(defmethod event-handler ::set-gravity [e]
-  (swap! *state assoc :gravity (:fx/event e)))
-
-(defn slider-view [{:keys [min max value label event]}]     ;; add event as arg
-  {:fx/type :v-box
-   :children [{:fx/type :label
-               :text label}
-              {:fx/type :slider
-               :min min
-               :max max
-               :value value
-               :on-value-changed {:event/type event}        ;; fire it on value
-               :major-tick-unit max
-               :show-tick-labels true}]})
-
-(defn root-view [{{:keys [gravity friction]} :state}]
-  {:fx/type :stage
-   :showing true
-   :scene {:fx/type :scene
-           :root {:fx/type :v-box
-                  :spacing 20
-                  :children [{:fx/type chart-view
-                              :gravity gravity
-                              :friction friction}
-                             {:fx/type :h-box
-                              :spacing 10
-                              :alignment :center
-                              :children [{:fx/type slider-view
-                                          :min 0
-                                          :max 100
-                                          :value gravity
-                                          :label "Gravity"
-                                          :event ::set-gravity} ;; provide events
-                                         {:fx/type slider-view
-                                          :min 0
-                                          :max 1
-                                          :label "Friction"
-                                          :value friction
-                                          :event ::set-friction}]}]}}})
-
-(renderer)
-
-(swap! *state assoc :gravity 1)
-
-(defn root-view [{{:keys [gravity friction]} :state}]
-  {:fx/type :stage
-   :showing true
-   :scene {:fx/type :scene
-           :root {:fx/type :v-box
-                  :spacing 20
-                  :children [{:fx/type chart-view
-                              :gravity gravity
-                              :friction friction}
-                             {:fx/type :h-box
-                              :spacing 10
-                              :alignment :center
-                              :children [{:fx/type slider-view
-                                          :min 0
-                                          :max 5  ;; 100 -> 5
-                                          :value gravity
-                                          :label "Gravity"
-                                          :event ::set-gravity}
-                                         {:fx/type slider-view
-                                          :min 0
-                                          :max 1
-                                          :label "Friction"
-                                          :value friction
-                                          :event ::set-friction}]}]}}})
-
-(renderer)
\ No newline at end of file
diff --git a/src/mw_desktop/fxui.clj b/src/mw_desktop/fxui.clj
index 52f28a7..f12fb97 100644
--- a/src/mw_desktop/fxui.clj
+++ b/src/mw_desktop/fxui.clj
@@ -3,12 +3,7 @@
             [clojure.core.cache :refer [lru-cache-factory]]
             [clojure.java.io :refer [resource]]
             [clojure.string :refer [join lower-case starts-with?]]
-            [mw-desktop.state :refer [get-state state update-state!]])
-  (:import [java.awt Desktop]
-           [java.io File]
-           [java.net URI]
-           [org.commonmark.node Node]
-           [org.commonmark.parser Parser]))
+            [mw-desktop.state :refer [get-state state update-state!]]))
 
 ;; OK, the basic idea here is we have a window divided vertically 
 ;; into two panes. The user can drag the division between the panes 
@@ -56,6 +51,7 @@
 ;; 'piechart count group by state'
 ;; 
 ;; In which case you probably have one graph page per rule.
+
 (defn- tile-image [{:keys [url]}]
   {:fx/type :image-view
    :image {:url url
@@ -83,8 +79,7 @@
     :children (map (fn [cell]{:fx/type tile-image
                       :tile-pane/alignment :bottom-center
                       :url (resource (format "%s/%s.png" tileset (:state cell)))}) 
-                   (flatten world))
-    }))
+                   (flatten world))}))
 
 (defn root-view [{{:keys [world rules]} :state}]
   {:fx/type :stage
@@ -94,6 +89,15 @@
                   :items [{:fx.type :scroll-pane
                            :content {:fx/type world-view}}]}}})
 
+
+(defmulti handle-event :event/type)
+
+(defmethod handle-event :default [e]
+  (prn e))
+
+(defmethod handle-event ::type-text [{:keys [fx/event fx/context]}]
+  {:context (fx/swap-context context assoc :typed-text event)})
+
 (defmulti event-handler 
   "Multi-method event handler cribbed from e12-interactive-development"
   :event/type)
@@ -106,4 +110,13 @@
                                     :state state}))
    :opts {:fx.opt/map-event-handler event-handler}))
 
-(fx/mount-renderer state renderer)
\ No newline at end of file
+(fx/mount-renderer state renderer)
+
+;; (defn ui
+;;   [_config]
+;;   (update-state! :ui
+;;              (fx/create-app state
+;;                  :event-handler event-handler
+;;                  :desc-fn (fn [state]
+;;                             {:fx/type root-view
+;;                              :state state}))))
\ No newline at end of file
diff --git a/src/mw_desktop/io.clj b/src/mw_desktop/io.clj
new file mode 100644
index 0000000..323a7bc
--- /dev/null
+++ b/src/mw_desktop/io.clj
@@ -0,0 +1,98 @@
+(ns mw-desktop.io
+  "Handle loading (and, ultimately, saving) files for the MicroWorld desktop
+   app."
+  (:require [clojure.java.io :refer [as-file file input-stream resource]]
+            [clojure.string :refer [split starts-with?]]
+            [mw-desktop.state :refer [update-state!]]
+            [mw-engine.heightmap :refer [apply-heightmap]]
+            [mw-engine.world :refer [world?]]
+            [mw-parser.declarative :refer [compile]]
+            [pantomime.mime :refer [mime-type-of]])
+  (:import [java.net URL]))
+
+(defn identify-resource
+  "Identify whether `path` represents a file, a resource (preferring the file
+   if both exist) or URL, identify the MIME type of the content, and return a
+   map with keys `:stream` whose value is an open stream on the content and
+   `type` whose value is the MIME type of the content."
+  [path]
+  (let [f (.exists (file path))
+        r (resource path)
+        u (when-not (or f r) (URL. path))
+        p' (cond (and f r) (file path)
+                 r r
+                 u u
+                 :else path)]
+    {:path p'
+     :stream (input-stream p')
+     :type (mime-type-of p')}))
+
+(defn load-ruleset!
+  "Load a ruleset from `path`, which may be either a file path or a resource
+   path, and should indicate a text file of valid MicroWorld rules.
+
+   Where a file and resource with this `path` both exist, the file is 
+   preferred. Updates global state."
+  [path]
+  (update-state!
+   :rules
+   (doall (compile (slurp (:stream (identify-resource path)))))))
+
+(defn assemble-tile-set
+  "Return a map of image files in the directory at this `dir-path`, keyed by
+   keywords formed from their basename without extension."
+  [dir-path]
+  (let [tiles (file-seq (as-file dir-path))]
+    (into {}
+          (map
+           #(vector
+             (keyword
+              (first
+               (split (.getName %) #"\.")))
+             %)
+           (filter #(starts-with? (mime-type-of %) "image")
+                   (remove #(.isDirectory %) tiles))))))
+
+(defn load-tileset!
+  "Load a tileset from `path`, which may be either a file path or a resource
+   path, and should indicate a directory containing same-size image files.
+
+   Where a file and resource with this `path` both exist, the file is 
+   preferred. Updates global state."
+  [path]
+  (let [{p' :path} (identify-resource path)
+        dir-path (as-file p')]
+    (if (.isDirectory dir-path)
+      (update-state! :tileset (assemble-tile-set dir-path))
+      (throw (ex-info "Tileset should be a directory of image files"
+                      {:path path
+                       :expanded dir-path}))))
+
+  (update-state!
+   :tileset
+   (doall (compile (slurp (:stream (identify-resource path)))))))
+
+(defn load-world!
+  "Load a world from `path`, which may be either a file path or a resource
+   path, and may indicate either a world file (EDN) or a heightmap (image).
+
+   Where a file and resource with this `path` both exist, the file is 
+   preferred. Updates global state."
+  [path]
+  (let [data (identify-resource path)
+        {type :type stream :stream} data
+        world (try (if (starts-with? type "image/")
+                     (apply-heightmap stream)
+                     (read-string (slurp stream)))
+                   (catch Exception any
+                     (throw
+                      (ex-info
+                       (format
+                        "Failed to read `%s` as either EDN or heightmap."
+                        path)
+                       (merge data {:path path})
+                       any))))]
+    (if (world? world) (do (update-state! :world world) world)
+        (throw (ex-info "Invalid world file?"
+                        (merge data {:path path
+                                     :data world}))))))
diff --git a/src/mw_desktop/e20_markdown_editor.clj b/src/mw_desktop/markdown.clj
similarity index 77%
rename from src/mw_desktop/e20_markdown_editor.clj
rename to src/mw_desktop/markdown.clj
index 4151cbd..2ce799a 100644
--- a/src/mw_desktop/e20_markdown_editor.clj
+++ b/src/mw_desktop/markdown.clj
@@ -1,24 +1,14 @@
 ;; lightly adapted from 
 ;; https://github.com/cljfx/cljfx/blob/master/examples/e20_markdown_editor.clj
-(ns mw-desktop.e20-markdown-editor
-  (:require [cljfx.api :as fx]
-            [clojure.core.cache :refer [lru-cache-factory]]
-            [clojure.java.io :refer [resource]]
-            [clojure.string :refer [join lower-case starts-with?]])
+(ns mw-desktop.markdown 
+  (:require [cljfx.api :refer [sub-ctx sub-val swap-context]]
+            [clojure.string :refer [join lower-case starts-with?]]) 
   (:import [java.awt Desktop]
            [java.io File]
            [java.net URI]
            [org.commonmark.node Node]
            [org.commonmark.parser Parser]))
 
-;; does not work any more :(
-#_(SvgImageLoaderFactory/install (PrimitiveDimensionProvider.))
-
-(def *context
-  (atom
-   (fx/create-context {:typed-text (slurp (resource "doc/grammar.md"))}
-                      #(lru-cache-factory % :threshold 4096))))
-
 (defn commonmark->clj [^Node node]
   (let [tag (->> node
                  .getClass
@@ -49,7 +39,7 @@
 (defn node-sub [context]
   (-> (Parser/builder)
       .build
-      (.parse (fx/sub-val context :typed-text))
+      (.parse (sub-val context :typed-text))
       commonmark->clj))
 
 (defmulti handle-event :event/type)
@@ -58,7 +48,7 @@
   (prn e))
 
 (defmethod handle-event ::type-text [{:keys [fx/event fx/context]}]
-  {:context (fx/swap-context context assoc :typed-text event)})
+  {:context (swap-context context assoc :typed-text event)})
 
 (defmulti md->fx :tag)
 
@@ -235,38 +225,8 @@
                            {:fx/type md-view
                             :node node})}]})
 
-(defn note-input [{:keys [fx/context]}]
-  {:fx/type :text-area
-   :style-class "input"
-   :text (fx/sub-val context :typed-text)
-   :on-text-changed {:event/type ::type-text :fx/sync true}})
-
-(defn note-preview [{:keys [fx/context]}]
+(defn markdown-view [{:keys [fx/context]}]
   {:fx/type :scroll-pane
    :fit-to-width true
    :content {:fx/type md-view
-             :node (fx/sub-ctx context node-sub)}})
-
-(def app
-  (fx/create-app *context
-                 :event-handler handle-event
-                 :desc-fn (fn [_]
-                            {:fx/type :stage
-                             :showing true
-                             :width 960
-                             :height 540
-                             :scene {:fx/type :scene
-                                     :stylesheets #{"doc/markdown.css"}
-                                     :root {:fx/type :grid-pane
-                                            :padding 10
-                                            :hgap 10
-                                            :column-constraints [{:fx/type :column-constraints
-                                                                  :percent-width 100/2}
-                                                                 {:fx/type :column-constraints
-                                                                  :percent-width 100/2}]
-                                            :row-constraints [{:fx/type :row-constraints
-                                                               :percent-height 100}]
-                                            :children [{:fx/type note-input
-                                                        :grid-pane/column 0}
-                                                       {:fx/type note-preview
-                                                        :grid-pane/column 1}]}}})))
+             :node (sub-ctx context node-sub)}})
diff --git a/src/mw_desktop/state.clj b/src/mw_desktop/state.clj
index 4d715de..66df39d 100644
--- a/src/mw_desktop/state.clj
+++ b/src/mw_desktop/state.clj
@@ -1,23 +1,24 @@
 (ns mw-desktop.state
   "Global state of the application."
-  (:require [mw-engine.utils :refer [member?]]
-            [mw-engine.world :refer [world?]])
+  (:require [mw-engine.world :refer [world?]]
+            [taoensso.timbre :refer [info]])
   (:import [clojure.lang Keyword]))
 
-(def valid-states
+(def valid-statuses
   #{:init :halted :halt-requested :running})
 
 (def state
   "Global state of the application."
-  (atom {:state :init}))
+  (atom {:status :init}))
 
 (defn get-state [^Keyword key]
   (@state key))
 
-(defn await-state
-  "Pause the current process until the global status is in the state `state-value`."
-  [state-value]
-  (while (not= (@state :state) state-value)
+(defn await-status
+  "Pause the current process until the global status is in the state `status-value`."
+  [status-value]
+  (while (not= (@state :status) status-value)
+    (info "Awaiting status %s" status-value)
     (Thread/sleep 10000)))
 
 (defn update-state!
@@ -34,15 +35,16 @@
     (when (and (:world deltas) (not (world? (:world deltas))))
       (throw (ex-info "Attempt to set an invalid world"
                       {:deltas deltas
-                       :state @state})))
-    ;; you can't change either the world or the rules while the engine is computing
-    ;; a new status for the world.
-    (when-not (= (@state :state) :init)
-      (when (or (member? (keys deltas) :world)
-              (member? (keys deltas) :rules))
-      (await-state :halted)) )
+                       :status @state})))
+    ;; you can't change either the world or the rules while the engine is 
+    ;; computing a new state for the world. 
+    (when (and (#{:world :rules} (keys deltas)) 
+               (#{:running :halt-requested} (@state :status))) 
+        (await-status :halted))
     (swap! state merge deltas)
-    (when (and (= (@state :state) :init)
-               (:world state)
-               (:rules state))
-      (swap! state merge {:state :halted}))))
\ No newline at end of file
+    ;; if we've got both a world and rules, and we're in state :init, we
+    ;; advance to state :halted
+    (when (and (= (@state :status) :init)
+               (:world @state)
+               (:rules @state))
+      (swap! state merge {:status :halted}))))
\ No newline at end of file
diff --git a/src/mw_desktop/swing_ui.clj b/src/mw_desktop/swing_ui.clj
deleted file mode 100644
index 0fa1649..0000000
--- a/src/mw_desktop/swing_ui.clj
+++ /dev/null
@@ -1,157 +0,0 @@
-(ns mw-desktop.swing-ui
-  (:require [clojure.java.io :refer [resource]]
-            [clojure.string :refer [join]]
-            [markdown.core :refer [md-to-html-string]]
-            [mw-desktop.state :refer [get-state update-state!]]
-            [seesaw.core :refer [border-panel editor-pane frame
-                                 left-right-split menu menu-item menubar native! pack!
-                                 scrollable separator show! tabbed-panel table text]])
-  (:import [org.htmlcleaner CleanerProperties HtmlCleaner SimpleHtmlSerializer]))
-
-;; This is probably a dead end. Its performance is terrible; the fxui version looks
-;; much more promising.
-
-;; OK, the basic idea here is we have a window divided vertically 
-;; into two panes. The user can drag the division between the panes 
-;; left and right. In the left pane is always the world; in the right, a 
-;; number of pages can be displayed.
-;;
-;; 1. Documentation;
-;; 2. The rule editor;
-;; 3. The log;
-;; 4. Data on what states are in use (and how many of each);
-;; 5. Some way to get data on other properties (for the mutual aid model, we
-;;    want to see how much food in total there is in the world, how much the
-;;    richest centile has, how much the poorest, and how that's changing over
-;;    time; but whether I have the skill to make that something the user can
-;;    configure is another matter).
-;;
-;; There is a File menu with options to:
-;;
-;; 1. Save the world as an EDN file;
-;; 2. Load the world from an EDN file;
-;; 3. Create a world from a height map;
-;; 4. Load a rules file;
-;; 5. Save a rules file;
-;; 4. Load (? or register?) a tile set (probably as a jar file?);
-;;
-;; There is a World menu with options to:
-;;
-;; 1. Start the world running;
-;; 2. Pause/Stop the run;
-;; 3. Select a tile set;
-;; 
-;; There is a View menu with options to change the display in the right 
-;; hand pane.
-;;
-;; 1. The rule editor;
-;; 2. The documentation;
-;; 3. Stats displays (but this needs more thought and experimentation)
-;; 
-;; One thought is I might define new rule language to create graphs and charts.
-;;
-;; 'timeseries total food where state is house group by decile'
-;; 'timeseries total food where state is house, fertility where state is pasture or crop or fallow'
-;; 'graph fertility by altitude'
-;; 'barchart fertility by state'
-;; 'piechart count group by state'
-;; 
-;; In which case you probably have one graph page per rule.
-
-(update-state! :world-view (table :model [:columns [{:key :name, :text "Name"} :likes]
-                                          :rows '[["Bobby" "Laura Palmer"]
-                                                  ["Agent Cooper" "Cherry Pie"]
-                                                  {:likes "Laura Palmer" :name "James"}
-                                                  {:name "Big Ed" :likes "Norma Jennings"}]])
-               :rule-editor (text :editable? true
-                                  :id :rule-editor
-                                  :multi-line? true
-                                  :text ";; This is where you will write your rules.")
-               :error-panel (text :editable? false
-                                  :id :error-panel
-                                  :foreground "maroon"
-                                  :multi-line? true
-                                  :text ";; Errors will be shown here."))
-
-(defn markdown->html
-  "`md-to-html-string` returns an HTML fragment that `editor-pane` chokes on. 
-   This is an attempt to do better. It sort-of works -- produces nice clean
-   HTML -- but the performance of `editor-pane` is still unacceptably poor"
-  [md-text]
-  (let [props (CleanerProperties.)]
-    (.setOmitDoctypeDeclaration props false)
-    (.setOmitDeprecatedTags props true)
-    (.setOmitUnknownTags props true)
-    (.setOmitXmlDeclaration props true)
-    (.getAsString (SimpleHtmlSerializer. props)
-                  (.clean (HtmlCleaner. props) (md-to-html-string md-text)))))
-
-(defn make-multi-view
-  "Make the right hand multi-view panel."
-  []
-  (tabbed-panel
-   :tabs [{:title "Rules"
-           :content (border-panel
-                     :center (scrollable
-                              (border-panel
-                               :center (get-state :rule-editor)
-                               :west (text :columns 4
-                                           :editable? false
-                                           :foreground "cornflowerblue"
-                                           :id :line-numbers
-                                           :multi-line? true
-                                           :text (join "\n"
-                                                       (map str (range 1 1000)))
-                                           :wrap-lines? false)))
-                     :south (scrollable
-                             (get-state :error-panel)))}
-          {:title "Grammar"
-           :content (scrollable
-                     ;; the performance of laying out HTML in an editor-pane 
-                     ;; is painful! RTF is better but not good, and unreliable.
-                     (editor-pane :editable? false
-                           ;; :multi-line? true
-                           :content-type "text/plain"
-                           :text (slurp
-                                  (resource "doc/grammar.md"))
-                           ;; :wrap-lines? true
-                           ))}]))
-
-(update-state! :multi-view (make-multi-view))
-
-(defn create-app-window
-  "Create the app window."
-  []
-  (native!)
-  (update-state! :app-window
-                 (pack!
-                  (frame :title "MicroWorld"
-                       ;; :size  [600 :by 600]
-                       ;; :on-close :exit
-                         :menubar (menubar
-                                   :items
-                                   [(menu :text "World" :items
-                                          [(menu-item :text "Run World"  :enabled? false)
-                                           (menu-item :text "Halt Run" :enabled? false)
-                                           (separator)
-                                           (menu :text "Create World..." :items
-                                                 [(menu-item :text "From Heightmap...")
-                                                  (menu-item :text "From Coordinates...")])
-                                           (menu-item :text "Load World File...")
-                                           (menu-item :text "Save World File As...")
-                                           (separator)
-                                           (menu-item :text "Import Tile Set...")])
-                                    (menu :text "Rules" :items
-                                          [(menu-item :text "New Rule Set")
-                                           (menu-item :text "Open Rule Set...")
-                                           (menu-item :text "Save Rule Set")
-                                           (menu-item :text "Save Rule Set As...")
-                                           (separator)
-                                           (menu-item :text "Compile Rules")])
-                                    (menu :text "Help" :items
-                                          [(menu-item :text "About MicroWorld")])])
-                         :content (left-right-split (scrollable (get-state :world-view))
-                                                    (scrollable (get-state :multi-view))
-                                                    :divider-location 8/10)))))
-
-(defn show-app-window [] (show! (get-state :app-window)))