Building 3, the main element of the architectural ensemble, opens onto a huge hall on two levels. It comes out below the middle terraces of building 4 towards the semi-covered central street leading to the studios of the school of art. The vertically striped motif of some of the walls gives rhythm to the movement of the eyes and of the body, it accentuates the perspective and plays with light. Other walls reveal the horizontal formwork motif, asserting convergence lines and the segmentation of space. The floor was later covered with Veronico tiles.