Giuseppe Caglioti, 91 years old, Professor Emeritus of the Physics of Matter, was interviewed for Impronte Politecniche, the new series of video interviews in which Professor Emeriti and Honorary Professors of Politecnico di Milano tell their story and at the same time look to the future of their discipline, retracing their beginnings, successes, trials, anecdotes, places, teachers and students encountered along the way.