"Bean" me up, Scotty

One of the major features of Millennium Park is a sculpture/structure called Cloud Gate or I often hear it referred to as "The Bean"  Here's brief description of it from the Millennium Park website:

Cloud Gate is British artist Anish Kapoor's first public outdoor work installed in the United States.

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. 

Hope that helps since I still don't really know what it is.  But, you can get some cool reflections off of it which is what I attempted to shoot, a nice shot of part of the Chicago Skyline.  And if you look really closely at the center of the picture towards the back you can see the reflection of some joker from the suburbs holding his camera up and getting the shot.