A new bridge for London and a trampoline funland in Wales the week in art

The floating forest for the Thames masterminded by Thomas Heatherwick, the underground trampoline theme park in a cave, plus Larry Clark's T-shirt range and a complete history of the photographic nude all in your favourite weekly dispatch

Radical Geometry
Hélio Oiticica and Lygia Clark are among the important artists examined in this survey of modernism in South America, featuring works from the Patricia Phelps de Cisneros collection. A chance to see some genuinely revolutionary art.
Royal Academy, London W1J from 5 July until 28 September

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