[math-fun] graviton-like cellular automaton

Gravitons are presumed to change the shape of spacetime, and if there are enough of them, perhaps even its topology. Does anyone on the list know of any cellular automata that, say, change the neighborhood based on the density or topology of clumps of "on" cells, or similar? -- Mike Stay - metaweta@gmail.com http://www.cs.auckland.ac.nz/~mike http://reperiendi.wordpress.com