“One day, Richards told me, he was watching as Partch set up up his legendary Marimba Eroica, whose lowest note vibrates at twenty-two cycles per second. Richards, walking away from the stage, noticed a curious effect. “I said, ‘Harry, it’s funny—when I stand right here, I don’t feel any vibration at all. I just hear the knock from the hit.’ Harry says, ‘That’s because you’re standing in the bottom of the wave. You’re at the nodal point. There is no sound there.’ That freaked me out, you know?” link