South Africa's installation, Otium and Acedia, celebrates liberation and playfulness as fitting statements of a country reborn from a convoluted, visceral history. Porky Hefer has designed a series of hanging nests in the form of animals, into which you can climb. The animals are fairly ferocious: aquatic predators such as the killer whale and the piranha whose gaping maws bristle with teeth. But Hefer's sub-aquatic utopia is also quirky and cheerful. For a country 'emerging' from its past struggles, a pervading sense of liberation and innocence takes on an emboldened meaning alongside the theme of utopia.