Does this 2D cellular automaton have a known name and history?


* n colors (numbered 1 to n), assigned randomly at the start.
* For each generation, every cell that has at least one neighbour cell with a color that is one higher changes its color to that "next higher" color. Additionally, the "lowest" color is considered "next higher" to the highest one.
* Emergent behaviour shows up best around n=16, disappears for much higher or much lower n


I have it [implemented on my website](http://www.brazzy.de/Muncher.php) so you can see it in action.


I saw this ages ago and always remembered it as a great example of emergent behaviour, but can't remember what it was called, and couldn't find it on Wikipedia or Wolfram Mathworld.



What's the name of this 2D cellular automaton?
[Cyclic cellular automaton](http://en.wikipedia.org/wiki/Cyclic_cellular_automaton)


