RUN IN TURBO MODE (SHIFT-click the green flag) Click with the mouse to put squares. Press z to toggle between live and dead squares. Press space to start the simulation.
This is a 1s1s simulation of Replicator! Enjoy, and don't forget to leave a love-it! More about Replicator: http://www.conwaylife.com/wiki/Replicator_(CA) What's interesting about this is that it replicates whatever you draw in, sooner or later, as long as it's not too big to reach the edge. In a real plane, it will replicate forever.