People can be made to see reddish green and yellowish blue—colors forbidden by theories ... forbidden colors and biased geometric hallucinations. Have you ever seen the color bluish yellow?

The original was apparently posted on Buzzhunt Akiyoshi Kitaoka’s incredible optical illusion website: You see embedded spirals, right, of green, pinkish-orange, and blue? Incredibly ...

While he perceived it as green, his wife saw it as blue. This disagreement led to the creation of his new website ismy.blue, ...

Tsimane' people who learned Spanish as a second language began to classify blue and green into using separate words, which their native tongue does not do. The human eye can perceive about 1 ...

When seen up close, snowflakes have incredibly perfect geometric shapes ... when bees started producing honey in shades of blue and green. They eventually attributed the odd-colored honey to ...

If you’ve ever argued with a friend over whether something is blue or green, you’re not alone. A new test called “Is my blue your blue?” reveals how different — or similar — your color ...