Chou Tun-i, appropriately apotheosized as ‘Prince in the Empire of Reason,’ completed and systematized the philosophical world-conception which had hitherto obtained in the Chinese mind. He did not ask his fellow-countrymen to discard any part of what they had long held in high esteem: he raised the old theories from the sphere of science to that of philosophy by unifying them and bringing them to a focus. And he made this unification intelligible to the Chinese mind by his famous T’ai chi t’u, or Diagram of the Great Origin (or Grand Terminus), showing that the Grand Original Cause, itself uncaused, produces the yang and the yin, these the Five Elements, and so on, through the male and female norms (tao), to the production of all things.