Named for the Greek philosopher Herakleitos (540–480 B.C.) of Ephesus. By means of his metaphoric clash (“life and death are the same so opponents that become metaphorical are identified with each other”) he constructed and visualized relations of a higher conceptual order. He was thereby able to give a unique and decisive contribution to the history of thought. He is well known for his sayings such as “no one can step twice into the same river” and his famous “panta rhei” (everything changes). (M 21133) _ _.