Was it a dream, or was it reality?

Moviegoers who were captivated by the twists and turns of Inception have been asking that question since they left theaters. Too bad there wont be a conclusion any time soon.

Christopher Nolan, who wrote and directed the movie, has revealed that he has no plans to shed any light on the ending of the film and instead would prefer to the leave it open for the audience to decide.

Ive been asked the question more times than Ive ever been asked any other question about any other film Ive made, he said. Whats funny to me is that people really do expect me to answer it.

After completing inception, Dominic Cobb (Leonardo DiCaprio) is reunited with his children. However the final seconds hint that his reunion could very well be a dream. The final sequence focused on his spinning top -- the indicator of whether or not Cobb is in a dream -- but does not show it toppling.

There cant be anything in the film that tells you one way or another because then the ambiguity at the end of the film would just be a mistake, Nolan said. It would represent a failure of the film to communicate something. But its not a mistake. I put that cut there at the end, imposing an ambiguity from outside the film. That always felt the right ending to me."

Another advantage to not revealing the truth behind the ending is that the door is wide open for a followup. Fans of the movie will have to wait a while though before finding out if Nolan will ever consider a sequel as he is currently busy working on The Dark Knight Rises.

Already Nolan has stepped away from the Superman reboot, which is being helmed by Zack Snyder, meaning that the third Batman film is his primary focus.

That film, he says, will end his Batman trilogy.

"Inception" hits Blu-ray and DVD Dec. 7.