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We have 3 types of color receptors- One for red, green, and blue. On the other hand, I wouldn't have a hard time believing that the rods (cones?- the things that are supposed to only see light/dark)...

There is no such thing as THE primary colors. There are many ways to choose 3 colors as the basis for all other colors we see. The basis that we choose can somewhat arbitrary.
As someone else...