
![]() LEFT: Pythagoras (sitting with open book), Parmenides (standing with open book), Heraclitus (seated, writing). Behind them higher up, Alcibiades (as soldier), Xenophon, and another, listening to Socrates.
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![]() MIDDLE: Close-up of the idealist Plato, holding his Timaeus,and the proponent of the mean, Aristotle, holding The Ethics.
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![]() RIGHT: Euclid conducting a proof, with the back of tan-robed astronomer Ptolemy, holding a globe, beside him.
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