For me the movie is simply about passion. Some have so much that it’s dificult for them to harness (Charlie). He litterally can’t function because of it...unlike his brother. Others use it to shield themselves from reality (Laroche). And, finally...some people have a missguided view of it (Susan). She believes that passion does not exist for her. So she seeks out what she believes it (passion) to be. All the while not realizing that passion is not purely about any object. It’s about how we relate to that object. How we see ourselves in that object. Essentially it’s about ourselves. About our identity.