Galleries 18, 19 and 20, bereft of decorations due to the interruption of Juvarra's building program, lead to room 21, the Audience Chamber. This latter room probably served as the bed chambers for Maria Beatrice, the eldest daughter of the Duchess of Aosta and Vittorio Amedeo I, King of Sardinia. The ceiling vault is decorated in pastel colors with eight groups of putti gathered at a faux balustrade. The entire pictorial repertoire in the room is the work of Giovenale Bongiovanni whose signature can be seen at the base of the vault, above the cornice.