Now have the tiles working properly. Also, user interface somewhat improved.

src/mw_ui/render_world.clj

@@ -23,7 +23,7 @@
   [cell]
   (let [state (:state cell)]
     [:td {:class (format-css-class state)}
-            [:img {:alt (world/format-cell cell) :img (format-image-path state)}]]))
+            [:img {:alt (world/format-cell cell) :src (format-image-path state)}]]))
 
 (defn render-world-row
   "Render this world row as a Hiccup table row."
@@ -41,7 +41,8 @@
                    rules/init-rules))
         rules (or (session/get :rules) rules/natural-rules)
         generation (+ (or (session/get :generation) 0) 1)
-        w2 (engine/transform-world world rules)]
+        w2 (engine/transform-world world rules)
+        ]
     (session/put! :world w2)
     (session/put! :generation generation)
     [:div {:class "world"}
@@ -64,6 +65,5 @@
      [:link {:href "css/states.css" :type "text/css" :rel "stylesheet"}]
      [:meta {:http-equiv "refresh" :content "5"}]]
     [:body
-     [:h1 "MicroWorld"]
      (render-world-table)
      ]]))

src/mw_ui/routes/home.clj

@@ -14,9 +14,17 @@
   (layout/render "about.html" {:title "About MicroWorld" :content (util/md->html "/md/about.md")}))
 
 (defn world-page []
-  (layout/render "world.html" {:title "Watch your world grow" :content (html (world/render-world-table)) :seconds (or (session/get :seconds) 5) :maybe-refresh "refresh"}))
+  (layout/render "world.html" {:title "Watch your world grow" 
+                               :content (html (world/render-world-table)) 
+                               :seconds (or (session/get :seconds) 5) 
+                               :maybe-refresh "refresh"}))
+
+(defn docs-page []
+  (layout/render "docs.html" {:title "Documentation"
+                              :components ["mw-engine" "mw-parser" "mw-ui"]}))
 
 (defroutes home-routes
   (GET "/" [] (home-page))
   (GET "/about" [] (about-page))
-  (GET "/world" [] (world-page)))
+  (GET "/world" [] (world-page))
+  (GET "/docs"  [] (docs-page)))