Leonardo did not plan to show his "Vitruvian Man" to the public, since this image was found in his personal records. According to Leonardo's own comments, the Vitruvian Man was created for the purpose of establishing the proportions of the (male) human body. The combination of postures of arms and legs gives 2 different positions: the silhouette with outstretched arms and legs brought together turns out to be inscribed in a square, and the pose where the legs and arms are spread apart to the sides is inscribed in a circle.
An interesting fact is that with careful observation it turns out that the center of the circle is the navel of the silhouette, and the center of the square is the groin.
Leonardo da Vinci was not the first to attempt to explore the theories of Vitruvius. However, in comparison with him, the studies of other scientists were much more modest. The Vitruvian Man is often seen as a kind of ideal of the symmetry of the human body and even the universe. It is curious that the experts could not recognize the personality with which the great Italian painted the Vitruvian Man. However, a number of experts agree that it was not so much a portrait as an attempt to depict the perfect mathematical proportions of a man. There is a version that da Vinci illustrated the Vitruvian man from himself. Vitruvian Man simultaneously represents 16 different positions. Many artists have attempted to recreate the figures associated with Vitruvius's calculations that a person could be inscribed in both a circle and a square, with the earliest known figure being by Francesco di Giorgio Martini in the 1480s. There is a possibility that Leonardo was impressed by the achievements of his friend Giacomo Andrea, an engineer and connoisseur of Vitruvius.
The original drawing by Leonardo is too fragile, as a result of which it is not displayed to the public. As a result, today it is kept in the Accademia Gallery in Venice.