Perfect metaphors and photography to the movie's meaning

Rating: 9/10 (4 May 2014)

This Nolan film may seem kind of "easy" compared to his others if you watch it very vaguely, however it is perfectly written and shown that it can be one of his best.
The film's main theme is guilt and escaping from it, and through all the movie we can see that every single thing and detail is trying to give us that clue:
First of all, Al Pacino's character can't sleep because being asleep would be the only way to avoid his guilt and be in peace, but since he carries the fear of his previous cases and the A.I. Investigation he can't find that peace to rest.
Second, the fact that is never dark on the town and the sunlight is always up again reaffirms that the truth is always out and there's no place there to hide from it, a possible reason why Pacino's character always tries to make his room darker, so he can find a place to hide from the light, the truth.
And third, the only reason why he shot his friend on the fog was because it was the only place where he could do it and get away with it, since it was never dark in town and he couldn't sleep, the fog seems like the perfect environment to let his real feelings and desires out and shoot his partner, the only place where he could hide; whether it was conscious or unconscious who knows, but he definitely wanted his friend dead.
So this film is a true masterpiece, and every single detail of it may reveal more to it's true meaning.