I have been enjoyably rambling around Chicago. Found:
a Powell's, plus
the Chicago Public Library: omg bookgasm. Plus they had some pianos in the music section, available to all, not just library-card holders. Very generous. Played one for a little while. Of course as a consequence it was a little beat-up, but still in tune and somehow seemed (as much as an inanimate object could be) happy to be played: like meeting an old friend for the first time, the light action was like a familiar maturity.
A Chipotle. This is not really remarkable, but I couldn't find any in Madison. Om nom nom.
A coffee shop on the corner of Dearborn and Madison, with free internet. Theoretically the library had it, but it was unusably slow.
The location of the Field Museum. They have an exhibit on maps. May go tomorrow or something.