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”.
In: 75
Light comes in a continuous spectrum, it doesn’t inherently have discrete colors. Color is a thing of our perception. And our color perception comes in a combination of three types of cone-cells in our retina. [Short, medium and long](https://en.wikipedia.org/wiki/Cone_cell#/media/File:Cone-fundamentals-with-srgb-spectrum.svg) types. For example 500nm light excites quite a bit of a response from medium cone cells, less from long cone cells and even less of a response from short cone cells. We perceive it as sort of a [bluish-green](https://imgur.com/ae0IQ49).
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