"In that way the trap was sprung: beyond the edge of the crater the air vibrated continuously, or rather, it vibrated continuously but in a way that involved different discontinuous vibrations. It was a sound that rose to fullness, faded, swelled again, and this modulation was part of an invisible pattern it followed, extended across time like a chequer of solids and spaces. Further vibrations were superimposed on these, and they were shrill and sharply separate, yet drew together in a halo, first sweet, then bitter, and as they contrasted or followed the movement of the deeper sound, they imposed a sort of circle or field or dominion of sound."
from "The Other Eurydice," in Numbers in the Dark,
by Italo Calvino, translated by Tim Parks