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 ...

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

The average human eye can see as many as 10 million variations in color, according to some estimates, from purest gray to laser green. Now scientists say they’ve broken out of that familiar range and ...