When I choreograph a piece by tossing pennies—by chance, that is—I am finding my resources in that play, which is not the product of my will, but which is an energy and a law which I too obey. Some people seem to think that it is inhuman and mechanistic to toss pennies in creating a dance instead of chewing the nails or beating the head against a wall or thumbing through old notebooks for ideas. But the feeling I have when I compose in this way is that I am in touch with a natural resource far greater than my own personal inventiveness could ever be, much more universally human than the particular habits of my own practice, and organically rising out of common pools of motor impulses.Merce Cunningham, The Impermanent Art.
Above, his space chart for Suite by Chance, 1952. Ballpoint pen and pencil on colored graph paper. MoMA.