The eye experiences colors from the degree to which they trigger the red, green, and blue receptors in the retina. However, certain combinations, like red and green, cancel each other out…when an object reflects both red and green light, your eye perceives it as no color rather than red-green.
However, if one eye sees an object as green, and the other sees it as red, your brain combines these into a red-green that cannot be seen under ordinary circumstances.
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