The following p4 c trailer for a flip-flop rake, which converts moons into a quadruple trail of checkers. Discovered by Josh Ball.

backflip.png

x = 56, y = 21, rule = s0/b2
54bo$7bo34bo5bobo4bo$8bo32bob2o6bo3bo$10bo30bo11bo$8bobo5bobo4bo7bo2bo
4bobo3bo6bo$5bo13bo2b3o2bo3bo19bo$4bo11bo3b2ob3obo23bo$5b2o5bo6bo4bobo
4bo3bo6b2o3bo2bo2bo$2bo8bo14bo24bobo$3bo7bo5bo7bobobo5bo2bo2bo9bo$8bo
3bo3b2o5bo3b3o9b3o8bo$6bo8bobo3bobo5bo9bobo9bo$7bo7bobob2o2bo2bo24bobo
$o3bo3bo7b2o3bo3b2o4bo7bo2bo2bo5bobo$3bo4bo8bob2o4bo5bo7bo$2bo3bobo16b
o11bo4bo6b2o$10bo21bo5b2obo2bo7bo$4bo5bo18bobo5b4o3bo2bo5bo$4bo3bo30b
3obo7bo3bo$5bobo30bo3bo7bo4bo$54bo!