illusions

Illusions of Colors

The brain can see colors which are not there, as this illusion by Kitaoka demonstrates, thanks to color constancy. Color constancy is an example of subjective constancy and a feature of the human color perception system which ensures that the perceived color of objects remains relatively constant under varying illumination conditions. A green apple for instance looks green to us at midday, when the main illumination is white sunlight, and also at sunset, when the main illumination is red.
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