You might say it’s just a pigment of your imagination ...

Add Yahoo as a preferred source to see more of our stories on Google. You perceive electromagnetic radiation in the form of light in all the colors of the rainbow. MirageC/Movement via Getty Images ...

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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 ...