Peter Brant began collecting Warhol works in 1968, when he was just 21 years old. His first purchase: a rare crayon and pencil sketch of a Campbell's Black Bean Soup can from 1962. Over the past 45 years, Brant's collection has grown exponentially to include everything from iconic silk screens from the "Mao," "Marilyn," and "Most Wanted Men" series; to Brillo boxes; Basquiat collaborations;...