Stepping Stone Automaton

Created by David Griffeath (on a Commodore 64), the Stepping Stone Automaton is known to simulate battle. It is created by taking every pixel and assigning it a random value between 0 and 1. If that random value is less than a set number (usually 0.5), then it is changed to the color of one of its adjacent neighbors (not including diagonals). At the left, there are two colors.