This film, made in one afternoon, is an "inspired promenade," the discovery of an exhibition with improvised text and commentary. Five shot sequences of ten minutes apiece, following the chronological order of the history of cinema as conceived by Henri Langlois thirty years ago. Two weeks later, the Musée was devastated by a fire at Palais de Chaillot. It is thus the final testament, full of emotion and passion, of the last masterwork of Henri Langlois.