'Spectre' Emerges as True Aperiodic Monotile, Outdoing 'Einstein' and 'Vampire' Tiles.
Computer scientists have discovered a new aperiodic tile called "Spectre" that can completely cover a flat surface without repeating a specific pattern. This kind of tiling has been a tricky problem in mathematics for a long time. The previously discovered "Einstein" tile was considered a one-in-a-million shape, but Spectre is an even rarer discovery.

