The world is awash with the color purple — lavender flowers, amethyst gemstones, plums, eggplants and purple emperor butterflies. But if you look closely at the visible-light portion of the ...

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 ...

ORLANDO, Fla. – By now, you’ve probably spotted at least one streetlight turning a blueish-purple hue while walking or driving in the evening. No, they’re not meant to be that color. While the lights ...