• The simplest forms in the universe are the sphere and the circle. I represent them by disks and then I vary them... spheres of different sizes, densities, colours and volumes, floating in space, traversing clouds, sprays of water, currents of air, viscosities and odours - of the greatest variety and disparity.

    Alexander Calder: The simplest forms in the universe are the sphere and the circle. I represent them by disks and then I vary them... spheres of different sizes, densities, colours and volumes, floating in space, traversing clouds, sprays of water, currents of air, viscosities and odours - of the greatest variety and disparity.
    "The Artist's Voice: Talks with Seventeen Artists, Harper & Row, New York and Evanston, Illinois". Interview with Katherine Kuh, 1962.