February 2, 2007 WHEN HUMANS WALKED THE EARTH by Jamie E17 The Chapman Brothers latest instillation currently on show at Tate Britain, is a series of 10 'impossible' machines that emulate biological and psychological states such as breathing, thinking or sexual intercourse, inspired by their 1993 work 'Little Death Machine'. They consist of tools, clamps, nails, milk bottles, eyeballs, brains and penises cast in bronze to create mechanical-like sculptures or artifacts loaded with sexual references. They question mechanistic theories of the human mind - notably those of Sigmund Freud and reference to Dada and Surrealism's ability to transform everyday objects into something that challenges conventional perception. 0n now until 10th June @ Tate Britain Millbank London SW1 Tate Britain