If you get into that world it can be like a dream. Amid thrilling montages of films past and present, drama and documentary, art house and blockbuster, the titular question is addressed and regularly answered: archive interviews and contemporary pieces to camera with auteurs are interspersed with ideas about audiences and materiality, while intertitles are dotted with aphorisms and quotes from directors and, appropriately, theorist André Bazin, whose collections of essays give rise to the name. There are clips of everything from Zorns Lemma to Vertigo, Ritual in Transfigured Time to Lord of the Rings, The Cremaster Cycle to The Long Goodbye. Choreographer and feminist filmmaker Yvonne Rainer describes butting my head against the wall, against familiar patterns and says of exhibiting her work, I go to some of my screenings and the reason to stay is to see when people will leave. Critic and director Jack Waters talks about cinema’s functions in relation to passivity and control, everything the camera records being documentation. Robert Altman insists nobody should be able to articulate precisely what his films are about; while Akira Kurosawa declares, A truly good movie is interesting and easy to understand. David Lynch. Alfred Hitchcock. Chantal Akerman. Costa-Gavras. Ken Jacobs. Michael Moore. Jonas Mekas. Bill Viola. Robert Bresson. They are all here, and more besides. A wonderful, compelling documentary that takes in the totality of the filmic medium from the actualités of the nineteenth century to the vines of today. Written and directed by Chuck Workman.