 This is the background from which Wolff’s own hints toward aesthetics emerged. Wolff introduces the central concepts and principles of his ontology in the second chapter of his German metaphysics, which deals with “The first grounds of our cognition and all things in general” (German Metaphysics, p. 66). After expounding the formal principles that are the basis of all truth, the principles of non-contradiction and sufficient reason, Wolff introduces the concept that is the substantive basis of his ontology, namely the concept of perfection. He defines perfection as the “harmony” or “concordance” (Zusammenstimmung) of a manifold or multiplicity of objects or parts of objects—or as he says in Latin, perfectio est consensus in varietate (Wolff, Ontologia, §503, p. 390)—and illustrates this abstract definition with the example of a work of technology: