A classic model simulating excitable media and Belousov-Zhabotinsky reactions. It follows a generalized "Rock-Paper-Scissors" mechanic with N states.
Each cell has a state from 0 to 15. In each step, a cell looks at its immediate neighbors (Moore neighborhood). If any neighbor has the exact next state in the sequence (i.e., state + 1), the cell is "eaten" and advances to that next state.
From initial randomness, the system spontaneously organizes into beautiful spirals, traveling waves, and persistent self-sustaining macro-structures.