Knowledge

Facts, science and history of optical illusions.
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Billie Eilish drawn in 3D by Stephan Pabst

What Optical Illusions Reveal about You

Can animals see optical illusions? Hosico cat shows it with optical illusion rug

Feeling deflated

Source/credit: wowsuchwows

The lady in the white t-shirt sitting on the first seat (right behind the woman with the yellow shirt) has put het coat over the handle of her suitcase. Because it is partly touching her legs, it creates the optical illusion of a leg without a body just standing in the subway.