From attached caption: "Konrad Wachsmann, professor of advanced building research at the Institute of Design of Illinois Institute of Technology, Chicago, explains principles of space-frame... Show moreFrom attached caption: "Konrad Wachsmann, professor of advanced building research at the Institute of Design of Illinois Institute of Technology, Chicago, explains principles of space-frame construction to students Maurene Strug and Shirley Courtois. A model of an open-air music shelter, designed b y an Illinois Tech graduate student for his master's thesis, and based on space-frame construction, is shown on the table." Photographer unknown. Date of photograph is unknown. Date range listed is approximate. Show less