I was thinking of the Foucault pendulum when I composed this piece. I saw this in action, in the Museum of Science in Houston, TX and also in Paris. It is an incredible invention by the French physicist Leon Foucault. A heavy metallic ball attached to a wire that moves with the rotation of the Earth. So this is why you can hear the melody going back and forth in a decisive way, so that it reflects the movement of a pendulum.