Carsten Höller's answer to the challenge of filling the vast cavern of the Turbine Hall was to build five helter-skelter slides, each of differing heights and speeds, taking punters from the galleries and the bridge to the floor. Reviews have differed wildly, from "exhilaratingly fast" to "simply horrible", but there's no doubt you'll regret it if you don't have a go! Go to www.tate.org.uk for more info.