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 don't think it would be so distressing if you had always experienced it, though of course, my "excitement" at the idea was based on experiencing the change from one to the other...