An "ant" (represented by a single red pixel) moves according to the color of the pixel it's on (black or white, in this case)
The up/down arrows change how many steps the ant takes before a new frame is drawn. -1 speed pauses it.
Quickly gets chaotic
after about 9500 steps, a pattern begins to form
This would go on forever, but the edge interferes and it starts to do other stuff
A few bridges later, the speed counter interferes
After that, it starts to make a mess everywhere forever