By taking us on a cumulative sequence from our own familiar gods, through those of other ethnic groups, to those of animals, Xenophanes shows that ou… - Catherine Rowett

As the Presocratic philosophers bow out and Plato arrives to direct the next drama in the series, the Sophists make an astounding final act. All singing, all dancing, they ask society to question its raison d’être, its political beliefs, its moral values, its religious beliefs, its educational system, its legal codes, and its codes of etiquette. They draw attention to the power of the media and ask us to consider whether, without the media, there would be any truth at all. The antagonism that they generate, as portrayed by the Socrates imagined in Plato’s dialogues, starts the ball rolling for some of the most exacting philosophical endeavours the world has ever seen.

So, with due thanks to those great heroes, the ancient authorities, we can now move on with a more cheerful heart to the rest of Presocratic philosophy. Many of the Presocratics’ words are lost, but we may still catch a glimpse of their strange forgotten worlds, woven into a splendid patchwork of ancient quotations and interpretations.

Whether or not Zeno was merely trying to defend Parmenides from the ridicule of others, there is no doubt that he has pushed the analysis of reality onto a new plane. He makes us think not just about objects in space, but about space as a structure within which they exist; about motion not just as the behaviour of physical bodies, but as a theoretical concept involving conceptual divisions in space and time; about number not just as a way of counting finite bodies but as a rational system potentially (or actually) continuing ad infinitum, with the problematic consequences that that might entail; about the notions of ‘before’ and ‘after’ in time, and how long the duration of the present is.