Color facts:
1) Boys and girls used to be dressed in identical white outfits.
2) A clothier decided he could get more business by inventing the sex-based color dichotomy.
3) Originally, pink was for boys and blue was for girls. This was justified with the argument that blue is gentle and calm and pink is forceful.
4) Gay guys used to be identified with the color green, such as by wearing a green tie. This was for meeting long before the hankie code. It was the Nazis who chose pink for their triangle, for whatever reason, that made pink identified with gay men. Gay women, for whatever reason, were labeled with a black one (
making the Apple Lisa apparently a lesbian). Note that, today, green is usually the most popular color with elementary-age boys — probably because of its identification with camouflage, ninja turtles, and other military aspects.
5) Our eyes are the most sensitive to green, although men are rather commonly partially colorblind with green and red.
6) Despite being less sensitive to red than to green we have many more cones for seeing red.
7) Blue light is seen by very few (around 2%) cones but those cones are much more sensitive and are mostly located outside of the fovea. It is believed the brain amplifies the blue information to compensate for us having so few of those cones.
8) When we have green and/or red objects in clear focus blue objects are slightly out of focus (chromatic aberration).
9) "Magenta (fuchsia/mauve) is an extra-spectral color that does not actually exist in nature. It is a product of our brains seeing red and violet light at the same time. That's why there is no magenta in rainbows. The irony of "pink" not existing in a rainbow...
10) Our brains cannot see red-green and blue-yellow even though we can "see" magenta.
11) Pink is actually red made more pale by white — not magenta or fuchsia. It's just that our culture imprecisely conflates colors like magenta and fuchsia with pink.
12) There are no violet or truly green stars.