The Sphere is a monumental cast bronze sculpture by German artist Fritz Koenig. The world's largest bronze sculpture of modern times stood between the twin towers on the Austin J. Tobin Plaza of the World Trade Center in New York City from 1971 until the September 11 attacks. The work, weighing more than 20 tons, was the only remaining work of art to be recovered largely intact from the ruins of the collapsed twin towers. After being dismantled and stored near a hangar at John F.