Ed Ruscha on Marcel Duchamp: 'He was a guiding light'

When conceptual art’s godfather finally had a retrospective, it was in California – where a group of young artists welcomed him to a game of naked chessIn typically singular fashion, Marcel Duchamp was 76 years old when he had his first career retrospective. The artist chose to present it in the unlikely location of Pasadena, a quiet, upscale Los Angeles suburb. The 1963 show was a coup for the visionary young gallerist Walter Hopps, whose Ferus Gallery formed the nexus of an emergin