The fourth cone in tetrachromats overlaps quite a lot with the other three (which is why most tetrachromats don't see more colors than trichromats). For people

The fourth cone in tetrachromats overlaps quite a lot with the other three (which is why most tetrachromats don't see more colors than trichromats). For people where the fourth cone is meaningfully distinguishable from the others, it doesn't seem weird to me that you wouldn't see many objects that are strongly activating just that extra cone and not the ones next to it (wavelength wise) because they're closer together. We don't see bright, "pure" magenta very much, and when we do it's usually because we've engineered it. Nobody is engineering pigments for tetrachromats to enjoy. If I'm right, people who are nearly (but not entirely) colorblind (anomalous trichromats) due to a shifted cone would likewise be able to dream in colors they are capable of seeing only dimly while awake, whereas dichromats wouldn't.