Two cranes and a skyline at Rush’s Rubschlager Building.

The tower crane is up and running for Power Construction at 1520 West Harrison Street, the site of Rush University Medical Center’s Joan and Paul Rubschlager Building.

I could be wrong, but it appears the tower crane is working on the cofferdam, while the steel is being erected by the rolling crane. (Rolling crane? Street crane? What should I be calling those things?) Whatever they’re called, and whichever is doing what, this dynamic crane duo is piling iron atop iron as the Rubschlager begins its 10-story journey.