Welcome to a city where pi equals 4 and circles aren’t round. ... Same wooden checkerboard on a light purple background, with a small, retro-style toy robot moving across it.

As a result, purple and magenta are known as "nonspectral" colors, because they don't really exist as actual electromagnetic radiation. Nonspectral colors like purple are made of two wavelengths of ...

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 ...

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 ...

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 .