One impulse is to take Bergman's masterpiece for granted. Since 1960 at least, with the breakthrough into new narrative forms propagated with most notoriety (if not greatest distinction) by Last Year in Marienbad, audiences have continued to be educated by even more elliptical and complex work. As Resnais' imagination was subsequently to surpass itself in Muriel, a succession of ever more difficult and rewarding films has turned up in recent years. But that good fortune releases nobody who cares about films from acclaiming work as original and triumphant as Persona. It is depressing that the film has thus far received only a fraction of the attention it deserves - at least in New York and Paris. (At the moment of writing, it hasn't yet opened in London.)