The Illusion of a Blue Sky

The sky isn't actually blue. It's violet. When sunlight hits our atmosphere,

it scatters shorter wavelengths more than longer ones. Violet has the shortest wavelength in the

visible spectrum, so technically that's what's being scattered most. But here's the thing.

Our eyes have three types of color receptors, and the blue receptors are way more sensitive than violet ones.

So even though violet light is flooding the sky, our brain interprets it as blue.

Wild, right? We've been seeing the wrong color our entire lives.