Art: A Haunted Man

ONE of the many tragedies of World War I was that it ruined a generation of artists and poets on both sides of the trenches. For every minor cult figure like Rupert Brooke, polishing his gung-ho stanzas and dying of a mosquito bite en route to the Dardanelles, a dozen real poets like Isaac Rosenberg and Wilfred Owen were cut down. Georges Braque was shot and lived, but the war deprived the 20th century of the mature work of Franz Marc, August Macke, Egon Schiele, Gustav Klimt, Umberto Boccioni and Raymond Duchamp-Villon, as well...