For the past three years, I've been teaching courses in structural engineering to prospective architects attending the School of the Art Institute of Chicago.  The students pictured were in our first class and are now about to graduate.  Wearing shirt and tie are two of my colleagues from Thornton Tomasetti who have also been teaching with me from day one.  Today's lesson was about lateral wind resisting systems in supertall buildings.  The students were just realizing how much concrete and steel it takes to make a 100+ story building stand up.