since we'd achieved some success playing around with hexagonal cellular automata in Python, we got bold and tried to implement automata on a "Cairo" grid (https://en.wikipedia.org/wiki/Cairo_pentagonal_tiling)—that's a particularly attractive tessellation of the plane with identical irregular pentagons, and I'd had some silly notion that maybe some really wild behavior might arise from a cellular automaton on such a grid but...honestly, it's not been very fruitful. I've tried rules that use both the immediate 7-cell neighborhood of each pentagonal cell and an extended 11-cell neighborhood, but mostly I've been getting either exploding behavior or patterns that settle down very rapidly and yield, at best, a few oscillators and not even a hint of a glider or a spaceship.
this particular GIF uses the 11-cell neighborhood and the rule B45/S34. at least it's not completely boring. ~Chara