There are some films that arrive here from the international festival circuit almost incandescent with self-importance. They hover into the cinema in a kind of floating trance at how challenging and moving they are. They are films with a profound reluctance to get over themselves. They look up at the sceptical observer with the saucer-eyed saintliness of a baby seal in culling season, or a charity mugger smilingly wishing a nice day on the retreating back of a passer-by. One such is Babel.