There is a rare genetic trait known as tetrachromacy, whose carriers have four colour receptors in their eyes The carriers are invariably women (because of genetics), and can perceive colours in ways normal people cannot. It is unknown how many of these mutants there are walking among us, and it's likely that they themselves may not even know...

The vast majority of us have no idea what tetrachromacy would be like. Anyone who had the supersense wouldn't know she did, let alone be able to describe it. After all, it is an exercise in futility for trichromats to try to explain their visual experience to color-blind people.

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