x = 27, y = 27, rule = B36/S23
oo$oo8$20bo$19boo$18bobo$17b3o$$23b3o$22bobo$22boo$22bo8$25boo$25boo!
A period 96 replicator based oscillator.
Here two blocks confine an replicator.  Other periods can also be
found by moving the blocks further apart and inserting more replicators.
Hugh Everett, 1994