I've actually seen this artists work. I saw the same piece but smaller, about 8 feet in circumference and it was on a swivel so it could turn; the price was around $100,000.
Google Goggles returned this http://www.flickr.com/photos/thwphotos/2248129685/ Il Grande Disco, Downtown Charlotte 42505 Bank of America Plaza, Charlotte, North Carolina, USA This large bronze sculpture entitled "Il Grande Disco," represents industrial growth. It is the creation of Arnaldo Pomodoro. Local people call this the Disco Wheel. Arnaldo Pomodoro http://en.wikipedia.org/wiki/Arnaldo_Pomodoro
i can shit in a box and ask a million for it but who would buy it? as an artist, i'd probably name the piece.. "dont open this"