Which of these have you wanted to have most?
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Counterpoint: most of the world isn't designed with a fourth primary colour in mind though, so it's possible the extra dimension would be very distressing. For one, I suspect some monochrome things wont't stay that way.
I heard a theory that the "magic" of witches in the middle ages was just tetrachromacy. They could tell, for example, if someone had a high temperature. This would be consistent with it being more commonly (only?) seen in women. "Killing all the witches" was counterevolutionary.
