Catch and release

Is this a very small prison?
Imprisoned!

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As I watched, this child was imprisoned then released by its mother from what appears to be a small, round cage in the children’s playground on Axel Dahlstr√∂mstorg.
Released!

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Closer inspection showed it actually to be a little roundabout (a merry-go-round in American English). Bitterly cold despite the bright sunlight.