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Facts, science and history of optical illusions.
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The history of optical illusions in art

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.