Those who complain about this movie being "depressing" and full of unanswered questions miss the point. An intelligent viewer must look beneath the surface; there's a clever story and a set of plot twists that await whomever is willing to make the minimum effort required to do that.
The movie keeps the viewer's interest by using a series of cinematic devices and by raising questions. The important ones get answered all right, while some unimportant ones are left open. Subiela himself admitted later that there is no real reason for Beatriz's changes of shoes, or for the blue liquid coming out of her mouth. But the central theme remains that of a man that approaches sainthood (note the numerous parallels with the story of Christ) by just doing what is logical---not out of any belief from a contrived moral system.
The movie keeps the viewer's interest by using a series of cinematic devices and by raising questions. The important ones get answered all right, while some unimportant ones are left open. Subiela himself admitted later that there is no real reason for Beatriz's changes of shoes, or for the blue liquid coming out of her mouth. But the central theme remains that of a man that approaches sainthood (note the numerous parallels with the story of Christ) by just doing what is logical---not out of any belief from a contrived moral system.