The sum and principal part of the art is the invention of the compositions of any subject whatever.

And the second part is that of the movements, which should have regard to their operations, being done with promptness according to the ranks of those who perform them, whether in sloth or in earnestness; and let the promptness of fierceness be of the highest quality required of the one performing it. As when someone must throw darts, stones, or other like things, let the figure show at need its utmost disposition in such an action—of which there are here two figures in various modes of action and of potency. And the first in vigor is figure a, the second is the movement b; but a will drive the thrown thing farther from itself than b, because, although both show that they wish to hurl their weight toward one same direction, b—having turned its feet toward that direction when it twists, and moving away from it into the opposite position, where it prepares the arrangement of its power—returns with speed and ease to the position where it lets the weight loose from its hands. But in this same case figure b, having the tips of its feet turned to the opposite side from the place where it wishes to hurl its weight, twists itself toward that place with great awkwardness, and consequently the effect is weak; and the motion partakes of its cause, because the preparation of force in every movement wishes to be with twistings and bend-