Inception's famous dream-within-a-dream concept doesn't come without consequences. Just one level down, time stretches roughly to somewhere near Arthur's initial explanation.

The ending of Inception sees Cobb going off to reunite with his kids before the spinning top confirms whether he’s in a dream or not, because he doesn’t care.

While I’m here, I’m going to try to do exactly what I want.” He lives the dream in a more literal way in his latest film, Inception, which opens next Friday (July 16).