Surrealists exhibit work in London . Works classified as found objects interpreted objects , perturbed objects and constructed objects are on show at the Surrealist Exhibition opening at the London Gallery in Oak Street , Piccadilly . Photo shows , the ' Machine for making cloud ' by Julian Trevelyan , at the exhibition . This shows a head in a mincing mahine , with cotton wool protruding from the other end . 23 November 1937 *** Local Caption ***