‘Heraclitus’ examines the questions raised by Heraclitus, pointing out that his sayings provide material for many different versions of his thought. Heraclitus called the systematic structure which underlies every aspect of our experience logos. This multi-faceted Greek word has many meanings, ranging from language, theory, and reason, to ratio, proportion, and definition. What exactly is this logos? How are we to interpret what Heraclitus says about it? Indeed, how should we translate the word in any particular saying? However these questions are answered, Heraclitus's sayings cry out to be read in their own right, as a radically anti-materialist project unlike anything previously known.