First thing that came to mind were "spaceships" such as gliders (c/4) and lightweight spaceships (c/2) in Conway's Game of Life. [0]: https://en.wikipedia.org/

First thing that came to mind were "spaceships" such as gliders (c/4) and lightweight spaceships (c/2) in Conway's Game of Life. [0]: https://en.wikipedia.org/wiki/Spaceship_(cellular_automaton) https://en.wikipedia.org/wiki/Spaceship_(cellular_automaton)