"The Theory of Color" has been a longstanding, if unproven, concept in my world. There are books which reference various words in correlation to natural phenomenon such as plants, the sky, etc, but they hold no real meaning to us and were swiftly forgotten save by those with an interest in archiving all known writings.

[ ... ]

For the record, I believe you would see the world as you do now were you to come to my own -- things that are "forgotten" still exist, even if we cannot see them ourselves.

[ It's a weird bit of work, which is why it's only theoreticals, but. Anyway. She has basis for this. ]