In the cinema, one extracts the thought from the image,' Andre Levinson observed over forty years ago, 'in literature, the image from the thought.' Inasmuch as the image comes first on the screen, the film is a more economical medium than the page. Whereas a film-maker can encompass an entire business office in a single frame, a novelist is limited to the piecemeal notation of each person and object in that office. 'On paper all you can do is say something happened, and if you say it well enough the reader believes you,' John Huston remarked once. 'In pictures, if you do it right, the thing happens, right there on the screen.