For one or more people to play along with Veils
Make plateaus: play long, sustained tones, clearly or not, not too loud, choosing freely from F3, G3, B♭3, C4, D♭4, F4, and G4, in any tuning, such that a fourth, a fifth, two fifths, or both a fourth and a fifth are always clearly sounding (in addition to the other intervals that may arise).
Enter softly and slowly any time after the film begins (i.e. after the black). Do not enter after the film goes black again; exit slowly if you are already playing. Also, there should be a few long silences, coordinated by the players before hand or not. These should be long enough that they begin to breathe.