Someone had dug a deep hole beside the sidewalk and placed a bathtub at the bottom:
I discovered some chandelier-like hanging sculptures under the train tracks at Nobel and Kinzey. I've never been under there before because it's a dead end, but it was really cool and there was a lot of graffiti on the walls. Graffiti is a rarity in Chicago because the city has a "Graffiti Blasters" program that immediately removes any street art that is created.
The "plant" in the pot below was actually twisted rebar:
It's too bad Chicago is so graffiti phobic. We've had problems with gangs here though, and keeping graffiti off the walls is supposed to help keep the gangs under control. I used to live in a neighborhood that had a lot of gang activity – my street was right on the dividing line between two rival gangs (Spanish Cobras and Latin Kings). The gang bangers would deal drugs right out on the sidewalk in front of my building; we called it "the drive-up window." There were occasional gun battles, and a policeman was killed on our corner one year. I was so relieved when I finally moved out of there, back in 2004.