This program is an implementation of Langton's ant. According to Wikipedia (https://en.wikipedia.org/w/index.php?title=Langton%27s_ant&oldid=948645690): "Langton's ant is a two-dimensional universal Turing machine with a very simple set of rules but complex emergent behavior. It was invented by Chris Langton in 1986 and runs on a square lattice of black and white cells." The ant is guided by a set of simple rules. If the ant is on a black square, it turns 90 degrees counterclockwise, changes the color of the square to white, and moves forward. If it is on a white square, it turns 90 degrees clockwise, changes the color of the square to black, and moves forward. These rules initially seem to produce a random pattern, but after about 10,000 steps, the ant starts forming a "highway," a repeating pattern that goes on indefinitely (or, in this case, until the ant hits the edge of the screen).
