Elementary cellular automata are systems made out of cells that can be either dead or alive at a given generation based on a formal rule set. Let the block data unravel vertical sequences of binary lifeforms! Rarity is determined by structural complexity and symmetry. The rarest you can find is a very detailed automata mirrored in all axes. You can find what rule was used to generate the structure by looking at the bottom right binary signature and convert it to decimal base. There's a total of 256 possible rules.