Faking tetrachromatic vision by applying a different color filter to each eye's input https://arxiv.org/abs/1703.04392 via @asl2
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I've wondered about this for a while. Shouldn't it be possible to achieve hexachromatic vision? (Maybe I should read the paper.)
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A (physicist) coworker bought the filters and tried this! The fourth color is reportedly very subtle. (I did not get to try)
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