Alberto Giacometti (1901-1966) was one of the century's greatest sculptors and painters. Famous in the 1930s for his surrealist sculptures, he suddenly isolated himself and began to make and remake various pieces and paintings, wrestling with complex problems of perception and representation. By the mid-1950s he had established his reputation as one of the most startlingly original artists of the 20th century. This 40-year critique by David Sylvester...