Lead instrument: An upright piano (with a slight patina of dust on its sound, not perfectly sterile). In the crescendos and climaxes, it must acquire an orchestral weight and grandeur. · Bass foundation: Cello or double bass. A deep, viscous tone that establishes the gravity of the orbit. · Atmosphere: A barely perceptible pad (background synthesizer drone) reminiscent of cosmic radio static or the breathing of con sordino strings (played with mutes). In the background, one can use a theremin — its smooth glissando perfectly imitates weightlessness and anxiety. · Accents: Rare, crystalline arpeggios on a harpsichord or music box in the interludes (symbolizing the "sparks of light").