Helicopters fly over (and under) the orbital city of the future. Soviet space art by Andrei Sokolov, printed on a 1982 postcard.

@doctorow I'm not an expert, but wouldn't helicopters in cylindrical space stations be really tricky? For example, spinning or not, the central axis of the cylinder would have a slight "down" direction of whichever flat end of the cylinder was closest.

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