So let’s say this Alien eyes see on the infrared level, he would see normal RGB like you and I, but could be still know there is colors there? What reason is there for the alien to discover there is colors there?
I think I can’t imagine how we discover something that we don’t see, or mostly that there is something that I don’t know
I remember the OnePlus 8 phone having a filter that accidentally showing what was behind a plastic object because of the frequency of the pictures it was taking, and I remember seeing Neyle deGrasse explaining how they changed pictures of space which gave us those great colors