Now that the twentieth century is over it begins to make sense to assess modernism as a whole, and in that context artists like Salvador Dalí become unexpectedly important. For decades he has been an asked-and-answered question, largely on the lead of his expulsion from the Surrealist group in 1939 (when Breton said his work was “little more than crossword puzzles”). He did not help his case by moving so aggressively into marketing, and at...