Leonardo DiCaprio plays a man who may never stop dreaming in two films this year (oh, hi, Shutter Island), but only Christopher Nolan's super smart, way cool follow-up to The Dark Knight matters. By grounding some high-wire concepts in the real world, Nolan let the plot get dream-within-a-dream complex—without losing the audience. And when things did get trippy (Joseph Gordon-Levitt's zero-G hallway chase), Inception went far beyond Neo's Matrix. In Nolan's universe, it's all about living in a permanent state of now. So, did that top ever stop spinning?