The book gathers twenty-four pictures chosen and commented on by outstanding witnesses of the work, intellectuals, colleagues, film directors and architects. Sebastião Salgado calls him simply Gianni, "the photographer of man", and picks a working-class family in 1950s Paris; the sociologist Domenico De Masi sees in workers heading to the factory a modern Quarto Stato; Marco Bellocchio reflects on the horror of the asylums, Renzo Piano is enchanted by a building under construction, Carlo Verdone is moved by the magic realism of children, and reflections in a train window spark a story by Alina Marazzi. His world is our world. Completing the book are a detailed biography and thematic sections of pictures with his own texts: Venice, Milan, the world of work, asylums, Gypsies, protest, the story of Italy, portraits, the home and the world, from landscapes to the great cruise ships.