The sound design, composed by Thomas Bangalter of Daft Punk, is equally crucial. It features a low-frequency hum (infrasound) that is felt rather than heard, a technique known to cause physical unease and anxiety in viewers. This is contrasted with the use of Beethoven's "Symphony No. 7, Allegretto," which plays over the tender final scenes, creating a stark emotional contrast between the beauty of the music and the tragedy of the film's context.
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Gaspar Noé uses a "spinning" camera technique in the first half to induce a sense of nausea and disorientation. The sound design, composed by Thomas Bangalter of