Looks like scary fun!
Anin would do it in a heartbeat!
http://sln.fi.edu/tfi/info/skybike.html Take a ride on a two-wheeler, balanced on a one-inch cable, 28 feet above the Atrium floor! Now open to visitors, The Franklin Institute's SkyBike is the only highwire bike on the East Coast, and only the second in the entire United States.
Philly's got it goin' onnnnn! it's all about the physical principles and science