This is the home of Crown Fountain, where two two-story towers made up of LCD bricks face one another. Each tower is illuminated by video of a local Chicagoan's face. It's a unique experience that shouldn't entirely be divulged ahead of time, but is well worth a visit. Make sure to bring your kids and to outfit them in some clothes that can get wet - there is a constant 4-5" pool of water at the base that kids are able to run around in, and the LCD towers do have water coming down their sides.
Wikipedia article:
http://en.wikipedia.org/wiki/Crown_FountainCategory:
art fountain public