Eli5: Why does red + blue = purple

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Red + yellow = orange. Orange sits between red and yellow in the rainbow. It makes sense mixing them provides an “average”

Yellow + blue = green. Green sits between yellow and blue in the rainbow. Same as above.

Purple does not sit between red and blue in the rainbow. Why do they combine to make purple?

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Anonymous 0 Comments

I can’t believe no one has said this yet, but using your own analysis (which is pretty good, honestly) purple actually is between red and blue. You’re just used to looking at colors in a spectrum that goes left-to-right following wavelengths, but if you look at a color wheel (how our eyes actually see colors irrespective of what wavelengths they are) you’ll see that purple actually is between blue and red, just as you’d suspect.

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