The Nasher Sculpture Center is the newest addition to the Dallas Arts District and provides an urban oasis of art and nature. The Center consists of a 54,000-square-foot building designed by architect Renzo Piano featuring the contemporary art collection of philanthropist and collector Ray Nasher and his late wife, Patsy, and a two-acre sculpture garden created by landscape architect Peter Walker. The Nasher Collection is considered one of the foremost collections, private or public, of contemporary 20th-century sculpture in the world. Comprised of more than 300 pieces, the collection features works by Calder, de Kooning, Kelly, Matisse, Miro, Picasso, Rodin and Serra, among many others.