For the sound design of the movie, Christopher Nolan used a Shepard tone, in which ascending notes are subtly cycled to give the impression of a never-ending rise in pitch. Also, he wanted to write the script by obeying this principle so that the audience could braid together three storylines, and they continually rise in anxiety and tensity. So, as one storyline is peaking, the other one is still to be built, and the third is entering the last phase.

Film

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