There are collections that document taste, and there are collections that reveal a way of seeing. Shaped by instinct rather than strategy, and arranged by legendary Parisian decorator Jacques Grange, it brought together Rothko and Royère, Agnes Martin and Alexandre Noll, Claude Lalanne and Jean-Michel Frank under one roof in a home Terry and Jean describe as "New York on the outside, Paris on the inside." The result is something that defies easy categorization: a living environment in which 20th century French design and masterworks of contemporary art speak to each other with startling clarity. Among the highlights: a monumental Rothko on paper of a scale and color balance almost never seen at auction, fifteen Claude Lalanne mirrors commissioned directly by Yves Saint Laurent and Pierre Bergé, and a Ruhlmann rug that left the sale's own specialists at a loss for words. This is the story of how two people, guided by curiosity and an almost scientific precision of eye, assembled one of...