Human, local, oriented, taken, and iterative, these are the change-harvester's bywords. In iterative change, we not only accept the reality of gradual stepwise refinement -- changing what we've already changed before -- we actually anticipate it and take advantage of it. With iteration, I think a great starting point for the concept is to watch just about any youtube video where a skilled artist draws a realistic rendering. What you will see almost inevitably is a direct implementation of iterative change. The strokes begin quite broadly, faintly indicating the broad contours of the subject. Experience is relevant here: those who are most familiar with drawing that particular kind of subject, will make contours that seem "right" more quickly than those less experienced.

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