The garden front of the main chateau is considered more successful. The enormous, double-height Grand Salon that substantially protrudes from the "corps de logis" clearly dominates the southern elevation. The salon is covered by a huge slate dome surmounted with an imposing lantern and is fronted with a two-storey portico that is almost identical to one at the Hôtel Tambonneau. The use of a central oval salon is an innovation adopted by Le Vau from Italy. Although he himself had never been there, he undoubtedly knew from drawings and engravings of examples in buildings, such as the Palazzo Barberini in Rome, and had already used one to great effect at his Château du Raincy. At Le Raincy the salon spans the "corps de logis" and projects on both sides, but at Vaux, because of the double row of rooms, it is preceded by the vestibule on the entrance side, "thus delaying and dramatizing the visitor's discovery of this, the centrepiece of the house." The lateral pavilions of the garden facade project only slightly but are three bays wide with traditional tall slate roofs like those on the entrance front, effectively balancing the central domed salon.