#N Pinwheel #O Simon Norton #C A period 4 oscillator. #C http://www.conwaylife.com/wiki/index.php?title=Pinwheel x = 12, y = 12, rule = B3/S23 6b2o4b$6b2o4b2$4b4o4b$2obo4bo3b$2obo2bobo3b$3bo3b2ob2o$3bobo2bob2o$4b 4o4b2$4b2o6b$4b2o!