The sculptor John Chamberlain is having a moment. Three of his large, brightly colored “foil” sculptures are currently lined up in the middle of the plaza at Rockefeller Center, following last October’s display of another work in the series on Avenue Winston Churchill during Art Basel in Paris. Mnuchin Gallery sponsored both exhibitions, with the monumental works priced at $5 million–$6 million, and the gallery is negotiating to sell one of the Rockefeller Center works.