Anaximander and the Architects opens a previously unexplored avenue into Presocratic philosophy—the technology of monumental architecture. The evidence, coming directly from sixth century B.C.E. building sites and bypassing Aristotle, shows how the architects and their projects supplied their Ionian communities with a sprouting vision of natural order governed by structural laws. Their technological innovations and design techniques formed the core of an experimental science and promoted a rational, not mythopoetical, discourse central to our understanding of the context in which early Greek philosophy emerged. Anaximander's prose book and his rationalizing mentality are illuminated in surprising ways by appeal to the ongoing, extraordinary projects of the archaic architects and their practical techniques.