Conway’s Game of Life in Clojure by Charles Ditzel.
Charles has collected links to three separate implementations of the “Game of Life” (aka cellular automata).
Before you dismiss cellular automata as “just graphics,” you might want to remember that Stephen Wolfram, the inventor of Mathematica is a long time CA enthusiast.
I’m not saying there is a strong connection between those facts but it seems foolish to presume there is none at all.