I'm not impressed by the changing-room 'illusion' since I clearly noticed most of the changes on the first watching without knowing I wasn't supposed to. Part o

I'm not impressed by the changing-room 'illusion' since I clearly noticed most of the changes on the first watching without knowing I wasn't supposed to. Part of the reason may be the somewhat clumsily compressed video which shows clear jumps in scenery between key frames as these draw attention to the parts of the scene which are changing. Maybe this works better with a longer key frame interval (which avoids the jumps but lowers image quality) or a really short one (which also avoids jumps but radically increases file size).