Nada on subjective formalism vs. mathematical. She's right to counterbalance the model-making head trips with a more centered "mimesis" (the "canons" of Leonardo & predecessors - squaring the circle on the human microcosm - were centered on genitals or navel). But math is everywhere. Nada herself did some division (Nada divided by Ron = Ada with remain d'Or). Gaze into your navel you'll see a very physical umbilical cord back to nautilus spiral seashell.