Hup, Two, Three, Four
Stepping Feet Illusion and radial version
Many other illusions at the site, including some favorites such as
Pinna-Brelstaff Illusion though I never actually call it that
Roget’s ‘Palisade’ Illusion I’ve seen a similar effect while walking past a door and seeing a crt monitor through the narrow gap between the door and jamb.
Motion Binding has a subtle demonstration about orthogonal dimensions really being independent
Here’s the index in case you want to pick and choose, rather than march through all of them
global RSS feed.