"Once cannot tame the voices of the flute, voices of such uncanny lightness yet miracle of being that they are able to tilt the two rivers, the visible and the invisible rivers, into diagrammatic discourse; and in so doing to create the four banks of the river of space into a ladder upon which the curved music of the flute ascends. Those banks are dislodged upwards into rungs in the ladder and into stepping stones into original space."