The grand staircase extends through all three floors of the main pavilion. As suggested by Hildebrandt, galleries overlook the stairwell on both upper floors. The large ceiling fresco by Johann Rudolf Byss (1713), who later became the director of the palace gallery of paintings, shows the four then known continents, around a central sun wagon of Phoebus Apollo. Sculptures (Jupiter, Juno, Urania and Cosmos) were made by Zammels. The vases, putti and pair of children are by P. Benkert and his workshop. Stucco work was done by Daniel Schenk. Painted railings that extend the real architectural features are by Marchini.