Physicists and vision scientists are lining up behind a provocative claim: the rich color we call purple is not a property of light at all, but a story the brain tells itself. Light in the real world ...

A male Broad-tailed Hummingbird photographed at the Rocky Mountain Biological Laboratory in Gothic, Colorado, where researchers conducted field experiments on avian color vision. Noah Whiteman / ...

Purple is a non-spectral color created by the brain from red and blue signals Individual differences in eyes and brain make each person see colors uniquely All colors we perceive, including purple, ...

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