The famous plan of the building is shaped like a bell. Turning our back to the scene and looking at the entrance, we see a mezzanine floor, with only two boxes on the right and two on the left, followed by two balustrades. Above are three more orders of boxes, the last one opens up to an ambulatory, forming a loggia. The architect chose to vary the style according to the height: Tuscan style at the bottom, Doric style for the first order of boxes, Ionic style for the second order. Finally, in this progression that goes from geometric to ornamental, we reach the loggia with its impressive Corinthian style.