| Dated: | 1967 |
| Instrumentation: | Installation of light and sound, with 4 identical orchestras, each consisting of 15 musicians: flute (+pic), 2 clarinets (+ e flat clarinet, + contrabass clarinet), bassoon (+contrabassoon) - trumpet, trombone, percussion, 4 violins and 4 cellos |
| Timing: | 6' |
| Premiere: | 1967 in Montréal at the Pavillon Français de l'Exposition Universelle, performed by the Ensemble Instrumental de Musique Contemporaine, conducted by Konstantin Simonovitch |
| Dedicated to: | |
| Commissioned by: | Robert Bordaz |
| Published: | Boosey & Hawkes Music Publishers |