For background, I have recently had occasion to research the topic of color blindness, and I came across a curious and very rare condition, unknown until quite recently, called TETRACHROMACY. This is a color vision defect, but it is a sort of ‘anti-color blindness'; the sufferer sees far more gradation of colors than a normal person. It affect only approximately 1% of females, and most are not aware of it.
This led me to speculate about the fate of a tetrachromatic painter in the past, who could produce works of sublime beauty and amazing depth- perhaps the greatest works of art the world has ever seen- that absolutely no male and very few females could even see, much less appreciate. I can think of several directions this might go in the hands of a capable and imaginative writer (neither of which I can lay claim to). If someone can use this idea in any way, I would love to read the results!