Gratuitous rainbow picture

I took this (and five others which didn’t come out as pretty as this one) on December 16, leaning dangerously out of Rebecca’s bedroom window. It was a full double rainbow at that point, but the old Canon doesn’t have a wide-angle lens and the rainbow was changing too fast to risk the panorama function, which I’ve never tried properly.
Note the slightly lighter sky outside the outer rainbow and the much lighter sky inside the inner rainbow. If it hadn’t shown in the picture I’d probably have thought that it was an optical illusion, and if the sky on the inside hadn’t been much lighter (the effect in reality was even stronger than in the photograph) I’d have seen it as a band of darker sky between the two rainbows.

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