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Technically, Lux Æterna is defined by Noé’s aggressive use of split-screen and stroboscopic lighting. For much of its runtime, the frame is divided, forcing the viewer’s attention to dart between simultaneous perspectives of the collapsing set. This "diptych" approach creates a sense of frantic, uncontrollable energy; while one side of the screen shows a producer plotting to fire the director, the other shows the director herself trying to manage a distracted crew.
The film begins with a deceptively calm dialogue between Charlotte Gainsbourg and Béatrice Dalle, both playing versions of themselves. They sit on chairs, backlit by a soft neon glow, exchanging anecdotes about their careers and the inherent madness of film sets. This conversation grounds the film in reality, presenting the industry as a shared history of trauma and performance. Gainsbourg and Dalle act as the emotional anchors of a narrative that is about to dismantle itself.