I looked outside a little while ago, and observed that the sky was blue.

But when I asked POV-Ray to do some radiosity with a blue sky, the 
entire scene came out blue. Which, logically speaking, isn't surprising. 
If the sky is blue, clearly it's emitting blue light, which would result 
in everything being illuminated blue.

And yet, when I look outside, the world is /not/ tinged blue. So... WTH?

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