oil on masonite
Chicago's my favorite city, no doubt, and "The Bean" is my favorite stop. And one of my all-time favorite subjects to paint. Officially titled "Cloudgate", it sits in Millennium Park and draws in people like honey to a bee.
This subject is great to paint for a couple of reasons - certainly it's fun and challenging, in that it's made up of shapes and colors, warped and unreal - so the challenge is to rely on your eyes to make all the shapes and curves and colors make sense in the end. Which, I guess, is what the challenge of painting is, no matter what you're depicting.