| Dated: | 1957 |
| Instrumentation: | Two / Four-channel tape |
| Timing: | 7' |
| Premiere: | October 5, 1958 in Brussels, Belgium |
| Dedicated to: | |
| Commissioned by: | |
| Published: | R.T.F. |
| The tape was created at GRM (Groupe de Recherches Musicales) in Paris, France.
The music was composed for a film by Enrico Fulchignoni Xenakis created a second version in 1968, again at GRM. Recording available from Electronic Music Foundation Media EMF102 |