DALLAS – Measuring more than 12 feet in diameter, Arnaldo Pomodoro’s massive Giroscopio I, dating to 1986-87, is moving in more ways than one. Not only does the fascinating bronze and iron piece created by one of Italy’s most renowned avant-garde artists immediately capture the imagination, but portions of the sculpture also physically move. Composed of external rings and two semicircular internal halves, the impressive sculpture, estimated at $400,000-$600,000, stars in Heritage Auctions’ Nov. 17 Modern & Contemporary Art Signature® Auction. Absentee and Internet live bidding will be available through LiveAuctioneers.