The Vitruvian Man is a world-renowned drawing with accompanying notes created by Leonardo da Vinci around the year 1487 as recorded in one of his journals. It depicts a nude male figure in two superimposed positions with his arms and legs apart and simultaneously inscribed in a circle and square. The drawing and text are sometimes called the Canon of Proportions or, less often, Proportions of Man. It is stored in the Gallerie dell'Accademia in Venice, Italy, but is only displayed on special occasions.
Leonardo based his drawing on some hints at correlations of ideal human proportions with geometry in Book III of the treatise De Architectura by the ancient Roman architect Vitruvius, thus its name. Other artists had attempted to realize the conception, with less success. Vitruvius described as the principal source of proportion among the orders of architecture the proportion of the human figure.