A new optical illusion excellently illustrates just how finicky our eyes are when it comes to perceiving colors.

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 ...

Here’s what it signals—and why it makes a ton of sense.

Butterfly wings get their color in ways that almost feel impossible. Up close, each wing is made of countless tiny scales that either hold pigment or manipulate light. The oranges, reds, and browns ...

Beetles that can see the color red? That s exactly what scientists discovered in two Mediterranean species that defy the norm of insect vision. While most insects are blind to red, these beetles use ...