INVERSION

The inverted spectrum is the hypothetical concept, pertainingto the philosophy of color, of two people sharing their color vocabulary and discriminations, although the colors one sees — one's qualia — are systematically different from the colors the other person sees.

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The concept dates back to John Locke.[1] It invites us to imagine that we wake up one morning, and find that for some unknown reason all the colors in the world have been inverted, i.e. swapped to the hue on the opposite side of a color wheel, the complementary color.

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