Very similar to ants.clj by Rich Hickey. Some trucks (agents) move money on a grid (refs) from a central bank to division banks. The division banks are decayed and central bank is refilled with another actor. The entire system is drawn with JPanel.
If you don't have lein, just download the script
Then run, lein repl
Once the repl is loaded, call the start function with (start)
Copyright (C) 2012 Matt Havener
Distributed under the Eclipse Public License, the same as Clojure.