This is a nice simple test to see if you distinguish colors like a dichromat, trichromat, or tetrachromat.
Linguist Log’s discussion of the Himba “study” and the dress picture brought up the fact that a small percentage of people have different numbers of cones between one eye and the other. For example, some women are actually color-blind in only one eye.
(Yes, gene distribution can be weird, and this might also be a chimera thing. Or it could be a developmental problem in babies that just doesn’t cause enough problems to be researched. Nobody knows for sure.)