The wall decoration of the court has been particularly well preserved on the outer wall of D and E (Fig. 90; cf. Pl. XIII). The surface is diversified by fantastic architectural designs in two stories, made up of slender columns with their entablatures, open doorways with steps leading up to them, and glimpses of interiors. In the panels thus outlined, figures of all kinds stand out in white relief on a bright red or blue ground. Above the arched doorway Jupiter sits, resting his right hand on his sceptre; near by, on a pillar, is the eagle. Further to the left a satyr offers Hercules a drinking horn. Another relief, not so well preserved, has a motive suggestive of the purpose of the building--Hylas at the spring seized by the nymphs. With this we may associate two designs having reference to the exercises of the palaestra: a boxer, at the left of the doorway of E, and at the right a man scraping himself with a strigil. On the outer wall of G is Daedalus, making wings for himself and Icarus. Under the colonnade at the rear, a herm stands close to the wall, having the features of a youth with a garment drawn over his head and covering the upper part of the body. For the explanation of it we are indebted to Pausanias. 'In the gymnasium at Phigalia, in Arcadia,' says this writer, 'is an image of Hermes. It has the appearance of a man wrapped in a cloak, and terminates below in a square pillar in the place of feet.' This is Hermes, the god of the Palaestra, here, as in Phigalia, in a guise suggestive of his function of Psychopompus, the conductor of departed souls. We have already met with an example of the same type in the court of the temple of Apollo. A sundial stood on the roof of the frigidarium and men's caldarium, supported by a foundation of masonry still visible. It bore an Oscan inscription, from which we learn that it was set up by the Quaestor Maras Atinius, in accordance with a decree of the council, the money for the expenditure being derived from fines. The fines were very likely collected here, by the official in charge of the building. Sundials were erected also in the other baths at Pompeii. They were a necessity, for all such establishments were conducted on a schedule of hours. Hadrian ordered that the baths in Rome should be open from the eighth hour, that is, after two o'clock in the afternoon; and a regulation in regard to the time of opening, if not of closing, was probably in force at Pompeii.