Patterns in the City

It's cold and damp outside again today, so here's a change of pace. Can you guess what it is? It's the ceiling at my train station at Randolph and Michigan, captured by my cell phone. I think the pattern is cool. However, I think I should have taken it at a different angle to not include so much of the wall. Oh well. It was fun to hear the comments while I stopped to take the shot--why is she taking a picture of the ceiling? You would figure I'd be used to it by now. Maybe after day 125 I will be. LOL.