Quincunx!

So I’ve built myself a little Quincunx machine, but instead of the usual little bouncy balls I’ve decided to make one that is color based. Each particle goes through five iterations of “paint”, getting a coat of eatieh black or white each time before dumping its payload into the puddle at the bottom. The longer it runs, the closer to true grey the puddle turns. Bored of waiting for results? Turn that particle flow way up for a screen full of pretty!

http://www.binaryspark.com/Academia/crafting/black_white/applet/