Medardo Rosso's sculptures consist of "unfinished" forms where the artist's interest in making "you forget the original material" shines through. The pinnacles of his artistic practice are reached in what is considered his last work, "Ecce Puer", intended as the last original work modeled by Rosso, who in the following years would replicate the subjects he had made so far. Commissioned by the industrialist Emile Mond, the sculpture portrays the features of his son Alfred where the surface of the face, treated with delicate solids and voids, captures the light and blends with the surrounding atmosphere, making explicit, in the field of sculpture, a particular phase of experimentation on visual perception.