The 110-ton elliptical sculpture is forged of a seamless series of

highly polished stainless steel plates, which reflect Chicago's famous

skyline and the clouds above. A 12-foot-high arch provides a "gate" to

the concave chamber beneath the sculpture, inviting visitors to touch

its mirror-like surface and see their image reflected back from a

variety of perspectives.

Inspired by liquid mercury, the

sculpture is among the largest of its kind in the world, measuring

66-feet long by 33-feet high.