Long slow crescendo. Short decrescendo. Long slow crescendo. Long decrescendo. Lovely rich deep, dark drones. Lovely high, bright tones. Extremely distorted voices. Some pitched electronic sounds that make a tune of sorts. And many wave-like motifs (short cresc/decresc), some sounding like actual waves. No abrupt changes; each layer moves slowly and majestically through time, growing and diminishing at a leisurely pace. A piece to savor over and over again, believe me.