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As a child, there was a cool thing to do when riding the escalator in a metro station with a high ceiling, or when swinging on a swing and looking straight up. It creates a strange, unsettling feeling, as if your insides are being compressed. Now, of course, you can't do that anymore, even if you go to a playground, you'll hit your head on the swing's railing, and not all the shafts in the great Moscow metro are wide enough to avoid contorting yourself into an awkward position.