Writing: As a reader I don't like vague endings. I don't want to put down a book and wonder what I read. A book needs to feel complete. Occasionally a book can be read from two levels and feel complete from both. "Life of Pi" is a clear, contemporary example. But a writer shouldn't confuse their own indecision and lack of conviction or skill with producing a multilevel book. Know what you're doing. The reader isn't going to figure it out for you.