Each cell holds 5 cultural features with q options each. A cell talks to a neighbour with probability equal to how much they already share, and when it does, it copies one feature they differ on.
Tap to plant a patch of strangers. The same ?seed= always gives the same run.
LITAxelrod’s dissemination of culture (1997), with a phase transition in q. Traits must stay within 0..q−1, or the page throws.
WALLA model of a mechanism, not of real societies.