Electric Sheep realizes the collective dream of sleeping computers from all over the internet. It's a distributed screen-saver that harnesses idle computers into a render farm with the purpose of animating and evolving artificial life-forms.

Each sheep is about 4 seconds long. Its shape, motion, and color are specified by a genetic code, a long string of numbers. If a user sees a sheep they like, they may press the up arrow key to vote for it. Sheep that receive more votes live longer and are more likely to reproduce. These votes form a fitness function for the esthetic evolution of the flock. [link]