Double D

I've always really liked these inflatable tennis courts, ever since one appeared in the park behind my house in Northampton, in the 1980s.  Not because they're a boon to tennis players in winter, but because of the shape.  The German architect Frei Otto was the original master of tensile and inflatable structures but I don't know if he liked tennis.  I'm sure he would have been pleased with this photo, though.  I have been trying to get an elegant shot of these for a few weeks now (some smaller examples below) but today the light was right, creating a remarkable translucent pair of tennis-enabling domes.

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