The Milwaukee Art Museum is located on the lakefront and has become a symbol of the city. The wings move at noon every day that winds are below 30 mph. So if you want to visit, try and time if for that event and wait on the bridge that can be seen in the left side of the photo.
This photo is a strobe effect of that movement. Even if you have only a few minutes for a visit, stop into the entrance hall and look up at the ceiling.