Cornsweet illusion

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English

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Wikipedia
Cornsweet illusion. The left part of the picture seems to be darker than the right one, though in fact they have the same brightness.

Etymology

It was described in detail by Tom N. Cornsweet in the late 1960s.

Noun

Cornsweet illusion (plural Cornsweet illusions)

  1. An optical illusion where an edge between regions of the same shade causes them to be perceived as different shades.