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Well it may well be that such people actually exist in the real world. There are genes which cause Red retinal cones to act as if they were G-cones, and there are genes which cause green retinal cones to act as R-cones. Individually these genes are responsible for Red-Green colour-blindness. But when they are both present, the subject shows no behavioral abnormalities! It is likely that these people are experiencing (what I call) red when they point at green things and utter the words, "that is green", and vice-versa.
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