User:Entity Valkyrie 2/Five polyominos
The oscillators shown on the right are Lightweight five polyominos, Middleweight five polyominos and Heavyweight five polyominos. The period is 4. All of the "five polyominos" oscillators have eight inactive cells that never die. It is possible to make a "seven polyominos" oscillator by supressing a over^2-weight version and supressing it with blocks, and also possible to be infinitely extended and still only use polyominos.