In Eldoris, an astronomer has measured the movements of stars; another has discovered stars that dance in the heavens as pairs, which nonetheless follow de Vouger's law of celestial bodies. Merona's Collegia Medico has published a paper which sorts blood into eight genera, each with a different keirna; by determining the genus of the blood, a doctor may transfuse blood to a patient based entirely on the principles of science and keirna--not, of course, for the outdated, perverse practice of blood transference, but for the humane purpose of prolonging a life.

Leaning into Dante's shoulder, Anne reads the letters from their correspondents in a soft, measured voice, pausing now and then to let him think through the mathematics and the theories: the arc of her words traces for him the movements of the heavens and the order of human bodies, and this, too, is a way of seeing.