Evidence of Collaboration
Evidence has been found that Leonardo might have been influenced by the work of Giacomo Andrea de Ferrara, a Renaissance architect, expert on Vitruvius, and close friend of his. Giacomo Andrea's original drawing has only one set of arms and legs while Leonardo's has the position of his man's arms and legs change.
Read more about this topic: Vitruvian Man
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“All credibility, all good conscience, all evidence of truth come only from the senses.”
—Friedrich Nietzsche (1844–1900)