0E0P Metacell

I was blown away by this, as it is a constructive proof that a Game of Life universe can contain a simulation of another universe, and that the simulation can grow to unbounded size

> "When one of these metacells turns off, it self-destructs completely, and when a metacell birth occurs, it must be constructed from the ground up by one of its neighbors. This allows 0E0P metacell patterns, when viewed from very far away (e.g., at a size where an entire metacell takes up a single pixel in the display), to be indistinguishable from normal patterns that use the same rule"