I read this once before and it's one of those facts I find endlessly fascinating. It's simple and obvious why it wasn't normal before recent times...
It just scratches my nerd fact itch I guess.
It's right up there with
- social security numbers were promised to never be used as essentially your "human number" for things and would only be used for ss benefits
And
- minimum wage WAS designed and WAS intended to be a livable wage. It very specifically was proposed and made law with the point being it's the lowest wage which a person can support themselves. People saying "minimum wage isn't supposed to be livable wage!" Are wrong.
Oh and
-we see the color that is not absorbed by an object. So essentially we see every color the object ISNT.