Making Sandspiel(maxbittker.com)

    // This code originally started life as a CAM6 simulator written in C
    // and Forth, based on the original CAM6 hardware and compatible with
    // the brilliant Forth software developed by Toffoli and Margolus. But
    // then it took on a life of its own (not to mention a lot of other CA
    // rules), and evolved into supporting many other cellular automata
    // rules and image processing effects. Eventually it was translated to
    // C++ and Python, and then more recently it has finally been
    // rewritten from the ground up in JavaScript.
    // The CAM6 hardware and Forth software for defining rules and
    // orchestrating simulations is thoroughly described in this wonderful
    // book by Tommaso Toffoli and Norman Margolus of MIT.
    // Cellular Automata Machines: A New Environment for Modeling
    // Published April 1987 by MIT Press. ISBN: 9780262200608.
    // http://mitpress.mit.edu/9780262526319/