The Richards Medical Research Laboratories, located on the campus of the University of Pennsylvania in Philadelphia, were designed by architect Louis Kahn and are considered to have been a breakthrough in his career. The building is configured as a group of laboratory towers with a central service tower. Rather than being supported by a hidden steel frame, the building has a structure of reinforced concrete that is clearly visible and openly depicted as bearing weight. Built with precisely-formed prefabricated concrete elements, the techniques used in its construction advanced the state of the art for reinforced concrete. (wikipedia.org)