“All of them illustrate a basic principle of structure formation: when appropriate simple rules are applied to certain situations, structure results as a consequence of interacting rules. This does not mean that any combination of simple rules and situations will cause structure to form – most do not – but rule combinations that result in some kind of structure are not that uncommon.”

“All of them illustrate a basic principle of structure formation: when appropriate simple rules are applied to certain situations, structure results as a consequence of interacting rules. This does not mean that any combination of simple rules and situations will cause structure to form – most do not – but rule combinations that result in some kind of structure are not that uncommon.”

— John E. Mayfield