Against the east wall of the garden stood a nymphaeum. This took the form of a free-standing aedicula structure heavily decorated in glass mosaic. Two large pilasters supported a pediment and a single gabled roof. The interior of the structure was a large vaulted niche. The exterior sides of the structure were painted blue and decorated with small birds in flight. On the front of the structure, at the bottom, a dado-like marble feature decorated both the pilasters. A textured material was applied to the back of the bottom of the niche. The remaining sections of the structure were decorated in blue, green, red, and white mosaic and white shells which formed various patterns across the structure. The vaulted ceiling of the niche was decorated to represent a shell, while the back wall of the niche had a depiction of a small building with swans holding ribbons or perhaps serpents, on either side. On the top of the pilasters, on either side of the niche, were depictions of dolphins (or sea monsters) holding tridents with their tails. Shells were used to outline the corners of the structure. At the base of the niche stood a rectangular marble podium from which water flowed through a mask into the small pool below.