But if you go back and look, for example, at Victorian Christmas cards, you're not just going to see red and green — you're gonna see red and blue ... foliage in the background of the ads ...

One might think it makes them more conspicuous - particularly against a leafy green forest background ... with normal colour vision, can see red, blue and green colours. But deer can only pick ...

Additive color primaries are red, green and blue. I bring all this up because every time I write "primary colors" and RGB in the same sentence, someone tries to mansplain that "everyone" knows the ...