Perhaps Nolan's most brain-dead film to date. The first half is like a familiar spy action movie, while the second half is completely immersed in another kind of feeling never seen before. As many of you probably already know, this is a movie about time and space reversal, not the familiar time travel of the past. So, basically, it involves two dimensions and perspectives of the story, one is normal space-time, and one is the opposite of the reverse space-time.