Cyclic Cellular Automata (CCA) exhibit complex self-organization by iteration of an extremely simple update rule. A specified number of Colors are arranged cyclically in a "color wheel." Each color can only advance to the next, the last cycling to 0. Each update a cell's color advances by 1 if there are at least Threshold cells of the next color within its neighbour set of size Range in extended Moore or von Neumann neighbourhood. These simple dynamics exhibit complex self-organization starting from randomness.
The purpose of this app is to show CCA has the ability of self-healing. User can choose the size and color of the paint brush and then dye the canvas. The self-organized pattern is ruined. But after a while, those cells will 'heal' themselives. The beautiful pattern will show again.