Fernando Grillo performed these four pieces, varying in length between five and 22 minutes, solo on double bass.

For the most part they were done live with a panoramic microphone; an additional contact microphone was used in "Fluvine Tre." These are mostly ambient sounds that sometimes dip below the threshold of audibility, sometimes create a serene mood with caressed tones, and occasionally emulate violent storms; at one point he manages to recreate the sound of an onrushing car with accuracy.

The CD reissue on Ampersand has photos, scores, and liner notes (both the brief original ones by Grillo and longer, more detailed ones by French composer Ana Maria Avram).