She had the sculptor Tullio Lombardo create her a new marble doorway from the studiolo to the grotto between 1522 and 1524. She also commissioned a new doorway for the entrance to the Studiolo from Gian Cristoforo Romano, with four bas reliefs, tondoes and multicoloured marble. Stefano L'Occaso, Il Palazzo Ducale di Mantova, p.128, Milano, 2002. The grotto itself contained wood-inlay panels from the earlier studiolo, produced in 1506 by Paolo and Antonio della Mola. Stefano L'Occaso, Il Palazzo Ducale di Mantova, p.128-130, Milano, 2002. In 1531 she added Allegory of Virtue and Allegory of Vice, both by Correggio, to the paintings in her studiolo. A 1542 inventory survives, giving some idea of how the paintings and objects were finally displayed on principals of harmony and symmetry but in a very high-density arrangement.
