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. An 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. This helps us identify objects. Some nonhuman species, such as monkeys and goldfish have also been shown to have color constancy. It is likely that all animals with color vision have color constancy.
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