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There's also "[impossible colors":](https://en.wikipedia.org/wiki/Impossible_color) : combinations of signals where there are no color in real world correspond, such as "redgreen" or "yellowblue".

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[@Blissey1":](/1228534#comment_5335682
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I know about birds and insects. No, I'm saying that correlation between receptors and visual colors isn't as straightforward as Light makes it sound. Adding fourth receptor in-between blue receptor and red receptor will not make "eight color". In 
P.S. factAlso, all non-spectral colors (such as magenta) don't actually exist, it's just a way our brain interprets seeing several lights with different wavelengths simultaneously.

There's also "impossible colors":https://en.wikipedia.org/wiki/Impossible_color : combinations of signals where there are no color in real world correspond, such as "redgreen" or "yellowblue".

"@Blissey1":/1228534#comment_5335682
I know about birds and insects. No, I'm saying that correlation between receptors and visual colors isn't as straightforward as Light makes it sound. Adding fourth receptor in-between blue receptor and red receptor will not make "eight color". In fact, all non-spectral colors (such as magenta) don't actually exist, it's just a way our brain interprets seeing several lights with different wavelengths simultaneously.