In the last years of his life Bodin dedicated himself ambitiously to his work, with which he hoped to penetrate the secrets of the universe. His Theater of Universal Nature (Theatrum) is a treatment of the science of nature, or natural philosophy. According to the title, the work addresses “in five books the efficient and final causes of all things of the world.” It is a well-organized encyclopedia of universal knowledge in the form of a dialogue between Theorus, a curious theoretician who observers the world and Mystagogus, a master and guide.  The first book examines the principals of nature and the origin and decline of the world. The second book addresses the natural elements of meteors, of rocks, metals and fossils.  The third books explores types of animals; the fourth addresses the spirit, and the fifth book concerns the number, movement, and grandeur of the heavens respectively. This is an example of those works of natural philosophy, which wished to be exhaustive, and were typical of the Renaissance. The accusations of naturalism and atheism, which his Colloquium of the Seven About the Secrets of the Sublime (Heptaplomeres) had provoked, were only reignited and expanded by the Theatrum, regardless of the fact that he repeatedly refers to an all-powerful creator who admires the “order” in all things.