When Ball State’s architecture grad students learned that commercial airplanes have around six million parts, they saw six million opportunities to transform urban planning. Professor Harry Eggink created a virtual “playground for an architect’s imagination,” giving his students a chance to use digital diagrams to get creative without worrying about costs. They designed bus stops and apartment complexes from the would-be waste. Next up: disaster shelters, emergency relief huts and much more, all from retired aircraft pieces.