Why isn't the sky violet? Is there any physical reason why the sky isn't perceived to be violet or is it all in our cones?
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4possible duplicate of Why is the sky not purple? – Kyle Kanos Sep 18 '14 at 18:59
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The spectrum of the sky is given by physics, the subjective color of that spectrum by biology, so it's a combination of both. – CuriousOne Sep 18 '14 at 19:03