Chicago’s coolest chasm, the Tower C cofferdam at One Chicago Square. Photo courtesy of Mike Conlon at Power Construction.

The calendar has flipped to February. That means it’s time to walk around the One Chicago Square site again and check on progress by Power Construction.

Let it be known that I walked around the site on the 10th, but it wasn’t sunny. So I went back Sunday. SUNday. Everything looks better on a sunny day.