Hello again. This will be a branch of the tree, dedicated to color theory from an empirical perspective. It's also really linear right now.
In the modern day, many people have such blatantly contradictory beliefs about the workings of color and don't even consider that worth thinking or worrying about. Children are taught in pre-K that the three "primary" (we'll get to this) colors are red, yellow, and blue, but this is just not true. You may be asking, why the fucking shit would they teach something so randomly wrong to everyone? If it was wrong, wouldn't it be obvious? And... wait, if I'm right, why do computers always use red, green, and blue? Why do printers use cyan, yellow, magenta, and black? Why is it that when I combine blue and yellow paint, I get, like, weird green instead of normal green, but I get normal green when I combine paint that's blue and yellow? aren't blue and blue both blue? Isn't this blue MORE blue? Why is nobody talking about this?
Now you're getting it, man. I've been upset about the public's ignorance on this matter my whole life. I've written 10+-page Google Docs instead of doing my schoolwork to try and bring my real-life friends into the light, but they kept saying things like "who cares?" and "it's not that deep.". If you are not blind, if you percieve the world through the medium of color, you should at least give a little bit of a shit about the massive fucking blindfold over your eyes. The RYB system first engraved itself into the public subconscious in medieval Europe where the masses were kept uneducated, sinners were burned, and all art and ideology that did not praise the Lord was sinful. Its design philosophy was "these are the pigments we already have lying around, and when you mix them you get colors that are more-or-less pretty much what you're looking for, so if it ain't broke don't fix it.". And this system, unchanged, is what's being taught nowadays in actual school to actual YOU.
There is no grand conspiracy here. Ignorance propagates through the mindset of "it's not a big deal, man.", and sometimes that pervades until it has cast a shadow over everybody, such that if one is never shown how the undarkened ground looks, one would argue in earnest defense of the idea that it cannot be any other way.
Come with me into the light.