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- DictionaryOp·ti·cal il·lu·sion/ˌäptək(ə)l əˈlo͞oZH(ə)n/
noun
- 1. something that deceives the eye by appearing to be other than it is.
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noun
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In visual perception, an optical illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality. Illusions come in a wide variety; their categorization is difficult because the underlying cause is often not clear but a classification proposed by Richard Gregory is useful as an orientation. Wikipedia