Like any other technique, leaving on a question can be a poor substitute for a more fitting ending, but when done properly it can reinforce a core theme within

Like any other technique, leaving on a question can be a poor substitute for a more fitting ending, but when done properly it can reinforce a core theme within the work. I am not a huge Inception fan, but I do think the cut at the end is an important part of the movie and a good example of effective ambiguity. It might scratch an itch to show the top falling of hold longer (to confirm he is in a dream), but what value comes from that resolution? Ending the film before the answer allows us to think about what we've seen earlier to try and answer it for ourselves. Even though the movie is over, the audience is left with a part to play as they leave the theater.