I'm geeking out over a little bit of science I recently learned:

The 3 color sensitive cell types in our eyes allow us to see Red, Green, and Blue color wavelengths, mixing and matching to give us the rainbow. But there's a flaw in our ability to detect what we perceive as opposing colors such as Red and Green. To our eyes, mixing red and green pigments gives us grey, not the color Red-Green. Our eyes cannot see red-green as a color. Dogs have a 2 color system, meaning they still see color, just not as rich as ours. And birds have a 4 color system, which pretty much says they'd be able to see the color red-green! I so jealous. 

So much for the perfectly created eye hypothesis. 

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Comment by Doc Feral on March 1, 2012 at 5:19am

If that's the case then why do complimentary colors in the same hue/tone and next to each other seem to vibrate visually? This isn't restricted to just red/green. But also blue, orange and purple/yellow. Sure you can take complimentary colors and use them, but they just can't both be the same hue/tone. One has to be slightly darker or bright than the other.  It's one of the things they warned us about in color theory class when I was going for my Design degree. 

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