Pistons can be powered diagonally or horizontally also know as Quasi-Connectivity. This BUG is in all versions except PE & WIN 10 witch they left out on purpose because it is a BUG and they didn't want to add BUGS in the game intentionally. Video Showcasing and explaining this: https://www.youtube.com/watch?v=gVU1PqN_OH8 -BUG