One morning, it had been raining all night, and there were these marvelous little clouds in the blue sky. As I was looking at these clouds I was thinking, wasn’t it Constable who sketched clouds to try to convey their motions. Why pretend they are moving, why not just move something? All of a sudden it hit me – if there was such a thing as composing music, there could also be such a thing as composing motion. After all, there are melodic figures, why can’t there be figures of motion?