The monumental group depicts the myth of Jupiter who, in order to conquer the young Leda daughter of the king of Sparta, turns into a swan. From the union with the god two eggs are born, from which Castor and Pollùce, the Diòscuri, as well as Helen of Troy, wife of Menelaus, and Clytemnestra, wife of Agamemnon, brother of Menelaus, were born. Arturo Martini - one of the greatest interpreters of Italian sculpture of the twentieth century - presented the plaster of Leda in 1926 at the 1st Mostra del Novecento Italiano held in Milan; from this plaster was then taken the sandstone sculpture exhibited in 1930 at the IV Exhibition of Decorative Arts in Monza, in the period in which (1929-1931) the sculptor was teaching at the local Higher Institute for Art Industry (ISIA). The work is characterized by a solid volumetric research which, thanks to the linearity of the scans and the solidity of the geometric construction, made light by the chiaroscuro passages, immediately makes it an icon, studied and reproduced on numerous occasions. Well inserted in the production of the master of the twenties, in the light of contemporary artistic research in Italy, Leda looks at primitive sculpture, at the Romanesque purity of forms, at the archaic synthesis that updates the fairytale dimension of the myth.