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We all know what red and yellow is. The existence of orange does not disprove red and yellow.
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Are we talking Newtonian color theory or Goethean color theory. Because it's all an illusion based on black and white.
https://en.wikipedia.org/wiki/Theory_of_colours
My room's windows are filled with Fresnel lenses*, so the shadows all have psychedelic fringes.
Like the rightmost column it's mostly white with red/yellow along one side and blue/violet at 90°.
*14" square, out of old overhead projectors, if you're wondering.