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In Magenta Ain’t a Colour by Liz Elliot, Elliot explains why magenta isn’t an actual color. The colors of the light spectrum all have wavelengths. Red being the longest and violet being the shortest. But magenta doesn’t have a wavelength! It’s actually just your brain inventing a new color when you see both the red and violet light waves at the same time. Pretty interesting stuff.
It’s part of a phenomenon known as Qualia. Qualia is basically the interface between how our brain processes information and how our mind interprets it.
A simple analogy is a computer. The picture that you see on a computer monitor is made up by the computer to represent the states inside it. Just like the brain, inside the computer, everything is coded in electrical spikes. Yet you see pictures and text on the computer's monitor. This is to help you interface with the computer, just as Qualia helps you to interface with your brain which is connected by your senses to your world.
This is pretty crazy. All those years that went by thinking that magenta was a color. Our brains are lying to us!
Oh, the mysteries of the universe.