In 2011, excavation continued at the centre of the gallery, also revealing various surfaces associated with the Trajanic construction site. In the room housing the Muse and Philosopher wall mosaic, the eastern sector, cut diagonally by the Trajanic walls, was excavated.

Two of this room’s walls were exposed: one almost 16 m long, with new patches of figured mosaic; on the other wall, about 10 m long, also presented the remains of mosaic decoration. The decorative scheme presented a series of registers. Buildings in perfect perspective can be seen in the uppermost register with male and female figures inside them. At the centre is a man and as well as the Muse and Philosopher seen in 1998, a centaur, a dolphin, and numerous decorative elements can be recognised.

The remains of a wall mosaic are also preserved on the south side of the room; at a lower level, the entrance to a nymphaeum, with the remains of a blue glass mosaic on the vault and a niche in the back wall with a hole for the fistula , opened in this wall. The structure was almost completely buried.