The German-born, American artist Eva Hesse (1936-1970) played a central role in the radical transformation of sculptural practice in the 1960s, using unconventional materials to create expressive works suggestive of the body and emotions. Throughout her career, Hesse produced a large number of small, experimental works alongside her large-scale sculpture. These objects, so-called test pieces, were made in a wide range of materials, including latex, wire-mesh, sculp-metal, wax and cheesecloth. Left in her studio at the time of her death, sold or given to friends during her lifetime, these objects evade easy definition, seen variously as experiments, little pieces, moulds, tests or finished pieces.