How That Crazy Cylinder Illusion WorksBryan Menegus7/28/16 11:44am335EditPromoteDismissUndismissHideGo to permalink Back in June we spotted a video that had us flummoxed: a few round-looking shapes appear as squares in a mirror. Rotating them 180 degrees produced the opposite result. Was it wizardry? CGI? Almost a month later, we finally have our answer.