Aristotelian scholars have argued that he regarded the natural world, and its study, as possessing a unique structure. This book examines Aristotle's philosophy of nature in this light. Claiming that the natural world exhibits unity without uniformity, it demonstrates that although he systematically investigated nature, Aristotle never forgot to recognize the limitations of natural science. Arguing that his claim led to the conviction that the heavens are made of a unique body, Andrea Falcon's book is essential reading for all students of Aristotle's philosophy of nature.