Ai Weiwei: Roots

At the centre of this exhibition by artist and activist Ai Weiwei are a collection of huge iron sculpture cast from the roots of rare Brazillian trees. The nature-based creations consider the idea of 'uprootedness' for humans as well as plants. Visitors will also be able to see Ai's recent LEGO art with a series of wall-based works that include a pixelated image of a refugee boat.