Charlotte Witt continues her highly regarded exploration of Aristotle's metaphysics in a book devoted to the ontological distinction between potentiality and actuality. She focuses on book ix, which provides the most sustained discussion of this distinction. Witt rejects the conventional reading of this key text—that Aristotle differentiated between the two concepts solely to further the investigation of substance. Instead, in an original interpretation of his work, she argues that his development of the distinction between "being x potentially" and "being x actually" allowed Aristotle to develop an intrinsically hierarchical and normative vision of reality.