Optical Wonderful
Size & Perspective Illusions
Illusions that exploit the brain's depth and distance cues to make identical objects look like different sizes, or make flat scenes read as three-dimensional.
Size & Perspective
Ames Room Illusion
A room that looks rectangular through a peephole but isn't, so two people of the same height look like a giant and a dwarf. Move away from the peephole to see why.
Size & PerspectiveEbbinghaus Illusion
The same circle looks smaller among large neighbours than among small ones. Measure how strongly it fools you and compare your score with other visitors.
Size & Perspective
Forced Perspective (Photography Technique)
The camera trick behind holding up the Leaning Tower of Pisa and making hobbits half the size of wizards, and the size constancy it fools.
Size & Perspective
Moon Illusion (Why the Moon Looks Bigger at the Horizon)
The moon looks huge on the horizon and small overhead, though it's actually slightly smaller on the horizon. The competing explanations, and how to test it yourself.
Size & PerspectiveMüller-Lyer Illusion
Two identical lines look different lengths because of the fins at their ends. Measure how far the illusion pulls your judgement in a one-minute test.
Size & PerspectivePonzo Illusion
Two identical bars look different lengths across converging lines. Measure your own illusion and see how it compares with your Ebbinghaus score.