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Toward the end of 1508, when most of the rooms were already frescoed, Bramante brought in a new talent, Raphael Sanzio, to execute the library. When Julius had eyes on his painting in the Stanza della Segnatura, he fired the painters who had nearly finished the new decorations for his private quarters and ordered Raphael to redo their works as he saw fit. The paintings that had so stunned Julius is today called The School of Athens. In it, Raphael created a visual anthology of classical philosophy that included many recognizable portraits in the crowd of erudites. We see his self-portrait as a golden-haired youth of extraordinary beauty, Bramante as Euclid holding class in geometry, Leonardo as Plato exhorting Aristotle to lift his gaze upward. Michelangelo’s portrait is the most like him, down to his negligent dress. He appears in the center of the foreground as Heraclitus, the melancholy philosopher, slumped over a makeshift table, alone in his thoughts.
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John T. Spike (Young Michelangelo: The Path to the Sistine)