Optical illusions definitions

Optical Illusions

A marble plaque in the Jacqueline Kennedy Garden at the White House. Uploaded 14.05.07. ...
Found on http://en.wikipedia.org/wiki/Optical_Illusions

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optical illusions

An illusion of vision usually affecting spatial relations. ... (12 Dec 1998) ...
Found on http://www.encyclo.co.uk/local/20973

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optical illusions

an image that deceives reality
Found on https://sciencetrek.org/sciencetrek/topics/light_and_color/glossary.cfm

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