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Originally Posted by Scion FR-S
Interesting supposition but I have never seen any evidence to support it. It's equally plausible that red is noticed more (if in fact that is the case) simply because in the natural world it is a far rarer colour than brown, green, and blue. There's a lot of pop evolutionary psychology floating around here. Evolutionary psychology is a lot like Freudian psychology, its theories can be invoked post-hoc to explain just about everything - no proof needed.
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All in all, red has the longest light wavelength. Why the sunset looks orangy-red, due to the angle of the sun and its light traveling longer horizontally rather than more vertically @ noon; also this is why the sky is blue.