Olivier Assayas films the encounter between the composer Stockhausen, legendary inventor of electro-acoustic music and the choreographer Angelin Preljocaj focusing on the creation of the ballet Eldorado.

Trough rehearsals and preparatory meetings, a real exchange sheds light on the resonance between music and movement and the birth, trough experimentation, of a creation, the prolongation of sounds in gestures, echoing each other until they achieve abstraction".