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probably during the studies of Vitruvius' text conducted and shared by Peruzzi, Raphael, and Sangallo.Ever since, the definition of the canon has been a collective endeavor that involved several generations of European architects, from Renaissance and Baroque periods, basing their theories both on the study of Vitruvius' writings and the observation of Roman ruins (the Greek ruins became available only after Greek Independence, 1821-1823). What was added were rules for

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