Easy to implement, but much room for optimization. The rules are simple, but give rise to complexity. Despite conservation of mass and such not being a part o

Easy to implement, but much room for optimization. The rules are simple, but give rise to complexity. Despite conservation of mass and such not being a part of the rules, what appear to us to be "objects" arise, and can even exhibit velocity! Physics-lite results out of nowhere. Finally, nerds like simulations.