<p><br /> Audiences will have to pay attention whilst watching Leonardo DiCaprio's latest feature and not just to the US heartthrob.<br /> </p><p><br /> The actor admits the plot for Inception, which centres on dreams, may be hard to follow.<br /> </p><p><br /> "This is a very complex film. It's very ambitious. It's high concept. It's cerebral. It's existential at times. It's completely insane," said Leonardo, 35.<br /> </p><p><br /> Written and directed by Batman filmmaker Christopher Nolan, it sees Leo playing Dom Cobb, a man who steals valuable secrets from people while they are dreaming.<br /> </p><p><br /> "It really took me months to sort of tap into Chris Nolan's mind and really understand what he was trying to accomplish and where my character would fit in within this Rubik's cube," he added.<br /> </p><p><br /> The movie also stars Oscar winner Marion Cotillard and Ellen Page. Inception is released in the UK on July 16.<br /> </p>
