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In the exercise of control, through feedback, an agent recursively senses what is taking place within reciprocal interactions relative to its postulated goal and uses what it senses to amplify or modulate what is taking place in order to more closely approximate realization of its goal. Feedback enables living forms to engage in self-maintenance, to conduct their lives purposively. And again, the universe being infinitely recursive, feedback serves living forms, not only in their efforts to approximate their purposes, but also to evince new, more suitable, sustainable purposes, as complications with established ones become evident.