This is a brilliant documentary and a fascinating study of a man who may be no more real than the forgeries he creates and gives away.
The movie cleverly begins as an investigative movie, leading us to believe it could be about the greatest art forger in modern history. While it remains about that person, it turns into something else as well: a keen observation of an individual building his identity from pieces of others.
The film explores his "artistic" process, but equally explores the psychological underpinnings of his behavior. By the end, you'll question if he is a brilliant and deceptive manipulator, or an emotionally stunted man-child who doesn't even fully understand the ramifications of his actions. It is powerful to realize that it could credibly be either (or both).