And finally, theres the distinct possibility that Christopher Nolan has something up his sleeve that none of us could guess. Maybe hes not revisiting one of his other films, or bringing back a thought-dead project, or joining a massive franchise like Bond, Batman or Star Wars. Maybe and this would be quite exciting Nolan is working on a lower-budget film, from an original idea that hes cooked up in between blockbusting behemoths. Equally, perhaps he has another original idea for a stunning visual spectacle that he wishes to see to fruition. There really are a lot of possibilities. Nolans first film, Following, was an original concept that Nolan made with his own money. The idea for Memento came from a short story by Jonathan Nolan. The Prestige was based on a novel, by Christopher Priest. The Dark Knight trilogy borrowed from certain comics. Inception was in Christopher Nolans head for eight years before reaching cinemas. Interstellar came from theoretical physicist Kip Thorne and film producer Lynda Obsts original idea. Essentially an idea for a Christopher Nolan film could come from anywhere. There could be a book on his shelf hes been meaning to adapt, or a scribbled note in a desk drawer that hes been trying to find funding for. We'll just have to wait and see. What do you think Christopher Nolan's next film will be? Share your theories down in the comments.