In doing these things I sometimes think of Christopher Alexander's "The Nature of Order". I have only read the first book, and that took quite a while. Perhaps sometime I will give my reactions - for what they may be worth - on his theory. Anyway, the patterns I develop are initially done without concern for obvious aesthetic, but as I begin to adjust and slightly re-arrange things, some of his comments about pattern, repetition and flow do come to mind. Although I wish they would not. They interrupt the flow of what I am trying to do - be spontaneous - too much. Too much theory gets in the way, unless it can be so woven into practice that it is instinctive.