in my opinion, in which "truth" just hide from you through whole story by presenting the story in a very unique way. You see pieces of story flying around. Have to take some time to figur out what actually happened, in what sequence and then may understand a little about what story is trying to tell you.
Recently I found I am not the only stupid guy that have to see several times to understand a little better. Many still claim not having any clues.....
Thought Nolan is kind of crazy guy.