We pass from the meagre remains of early Roman painting to the decorative frescoes of Rome, Herculaneum and Pompeii, which introduce us to an art influenced like the contemporary sculpture by Hellenistic models. The scheme of colour is no longer conventional but naturalistic ; the picture is concentrated in space, i.e., figures are no longer isolated on a neutral back ground; difficult effects of linear and aerial perspective are at tempted and the modelling of figures is often excellent. It must be premised that this style of wall-decoration was a new thing in the Augustan period. In the Hellenistic age the walls of palaces were veneered with slabs of many-coloured marble (crustae) ; and in humbler dwellings these were imitated in fresco. This "incrus tation" style is found in a few houses at Pompeii, such as the Casa di Sallustio, built in the 2nd century B.C. but before the fall of the republic it had given place to what is known as the "architectural" style, in which columns and other architectural features are introduced in order to give the illusion of outer space, and this illusion is heightened by the landscape back grounds, which are often enlivened by figures. An example of
such decoration is afforded by the "Odyssey landscapes," dis covered on the Esquiline in 1849, amongst the remains of a large private house, attributable at the latest to the period of Claudius. The walls of one room were decorated in their upper portion by pilasters treated in perspective, through which the spectator ap pears to look out on a continuous background of land and sea, diversified by scenes from the voyage of Odysseus. The artist, it appears, has been mainly interested in the landscape which is sketched with great freedom, but he shows no scientific knowledge of perspective, and commits the natural error of placing the horizon too high. It is clearly to such works as these that Vitru vius refers (vii. 5) when describing paintings which "unfold mythical tales in due order, as well as the battles of Troy or the wanderings of Odysseus through landscapes (topic)." We should doubtless reckon within the same class those "small scenes from the Homeric cycle within a framework in which blue and gold are predominant" in a room of the beautiful house on the Pala tine, identified by Ashby as the doinus transitoria of Nero, and the numerous examples from the Homeric cycle at Pompeii (cf. especially the series in the "House of the Cryptoporticus" in Insula 6, near the newly-explored Via dell' Abbondanza).
The use of landscape in decoration is stated by Pliny (N.H., xxxv 116) to have become fashionable in Rome in the time of Augustus. He attributes this to a painter named Studius, who decorated walls with "villas, harbours, landscape gardens, groves, woods, hills, fishponds, canals, rivers, shores," and so forth, di versified with figures of "persons on foot or in boats, approach ing the villas by land on donkeys or in carriages, as well as fishers and fowlers, hunters and even vintagers," a description which exactly fits the continuous landscape of the yellow frieze in one room of the house of Augustus (the so-called "house of Livia") on the Palatine. Vitruvius, too, in the passage above quoted, speaks of "harbours, capes, shores, springs, straits, temples, groves, mountains, cattle and herdsmen. . . ." Existing paintings— those, for instance, of a columbarium in Villa Doria-Pamfili, recently transferred to the Terme—fully confirm the statements of ancient writers. In the villa of Livia at Prima Porta the walls of a room are painted in imitation of a park; from the villa of Fannius Synistor at Boscoreale we have a variety of landscapes and perspectives ; and in the house discovered at Rome in the grounds of the Villa Farnesina by the Tiber—the paintings of which are in the Museo delle Terme—we find a room decorated with black panels, upon which landscapes are sketched in with brush-strokes of white.