The American sculptor John Chamberlain, known for using parts of wrecked automobiles in his volumetric, abstract work, is widely considered one of the most important artists of the 60s generation. Here, he speaks with curator, museum director, writer and cultural catalyst Hans Ulrich Obrist, editor of The Conversation Series, about everything from the need for a redesigned hospital gown, to his relationship to Donald Judd and Marfa, Texas,...