A book arrives with the intriguing title Mart Stam's Trousers (010 Publishers, £16). It includes an interview with Peter Smithson, explaining all. The phrase refers to a rare photograph of Le Corbusier, Mies and Stam, subsequently doctored Stalinist-style to remove Stam, presumably considered architecturally incorrect. But, for the sharp-sighted, his trousered leg remains faintly visible! Historians of Modernism, take care.