The Chicago Window is a particular design that met the delicate balance of providing light and air into the depths of large towers. For a brief period of time, the need for and the ability to produce these large window was possible with available technology. But today, these windows appear for reasons other than functional necessarity. In this video, we chat with Gunny Harboe who has preserved dozens of Chicago windows in the Reliance Building, Marquette Building, among others. We explore the window’s history, why it was such an ideal solution, and what went it the popularity of this ubiquitous architectural element.