From what I understand, humans can see red green and blue and everything in the middle. Some animals I’ve heard see more colors than us, so what’s to say that some things in nature are colors that we don’t see? Who’s to say that some apples are red? And instead a different color that we don’t have a name for because we can’t process it?
How can we tell if this “apple” is as a matter of fact “red”.
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Birds can see some ultraviolet light and many birds actually have some ultraviolet patterns on their feathers, but we don’t see them with just our eyes. Crows have UV colours but we see them as just black, pigeons have some UV colours but we see them as mostly grey with some shades of green and purple here and there.
If a red apple was also colored in some UV light, we would only see the red (just like we don’t see it in pigeons). If an apple was colored ONLY in UV light, it would look black to us (just like crows).
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