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date: 18 April 2024

chequer–shadow illusion n. 

A Dictionary of Psychology

Andrew M. Colman

An image of an object casting a shadow across a chequer-board, the same colour or shade being used to depict one of the ‘dark’ squares outside the shadow and one of the ‘light’ squares inside it (see illustration). The visual system discounts for the shadow, even if the viewer does not notice it consciously, causing the ‘dark’ square to appear much darker than the ‘light’ square. This shows that the perceived ... ...

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