Christopher Nolan is obsessed with Shepard tones. Nolan’s Dunkirk is a nerve-wracking movie and it is mainly because of its incredible sounds. Three separate storylines tell the tale of the famed World War II removal in an intense two hours of movies. I have to say if you didn’t watch the movie with some decent sound system you have missed a big part of the movie. Most of the feel of the movie comes from the film’s score uses Shepard tones — layered sound waves that simulate a steady ascent in tone — to create a feeling of building tension. They’re a personal favorite method of Nolan’s: he’s based sound effects and entire soundtracks with other composers on the auditory illusion. In Dunkirk, composer Hans Zimmer created his masterpiece soundtrack around the effect — and it’s an absolute auditory masterpiece. Check out the video below to learn more in great detail about this incredible soundtrack.