The world is awash with the color purple — lavender flowers, amethyst gemstones, plums, eggplants and purple emperor ...

A red Etch A Sketch toy set against a light purple background displays an animation of a simple line drawing. Math, Revealed. Taxicab Geometry. Welcome to a city where pi equals 4 and circles aren ...

The visible light spectrum detectable by human eyes makes up only a small fraction of wavelengths (0.0035%, to be exact). Those colors are made available to us by millions of densely packed ...

To compensate, the brain bends the spectrum into a circle, making the two extremes meet at purple. It’s an illusion of physics and neuroscience that makes us think we see a nonspectral color .