Big-screen cinema is becoming a question of immersion. The ability to transport an audience into a specific location is what characterises some of the more distinctive films around. Last year, Birdman or (The Unexpected Virtue of Ignorance) – a film about a fading film actor in an existential crisis – won four Oscars. Less than a year later, director Alejandro González Iñárritu and his director of photographer, Emmanuel Lubezki, is back with a yet more ambitious project. The story of The Revanant is based on fact. Hugh Glass, a fur-trapping frontiersman in the 1820s survived extreme ordeals of weather, terrain and wildlife to explore the Upper Missouri river. His endurance became legend. In the film, he is played by Leonardo DiCaprio with fierce concentrat