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The 'emblematic image' on the tablet held at Pythagoras's feet is the clue that the fresco is about the mathematical harmonies of the universe. Balancing the Pythagorecians around the slate at the lower left are the astrologers, symmetrically placed on the other side of the foreground. These two groups are rightly represented as conterparts, for what the Pythagoreans defined with musical consonances, the astrologers found out by studying the sky. Plato's raised finger expresses a final connection: from the science of numbers comes music; from music comes cosmic harmony; and from cosmic harmony comes the divine order of ideas