Sometimes they are ornamented with imitations of framed panel-pictures, mostly containing mythological groups, and scenes in small genre. To these was generally given a background of landscape, so that the figures represented were little more than picturesque accessories; and this custom seems to have led, perhaps even in the Hellenistic period, to true landscape-painting. (Fig. 309.) According to Pliny, Ludius, or Studius, introduced this style in the time of Augustus, of which, besides those of Campania, the frieze decorations of the newly discovered house of Tiberius upon the Palatine give the best representations, and form an illustrated commentary upon the descriptions of the works of Ludius. These are characterized as showing “villas and halls, artificial gardens, hedges, woods, hills, water-basins, tombs, rivers, shores, in as great a variety as could be desired;” besides “figures sitting at ease, mariners, and those who, riding upon donkeys or in wagons, look after their farms; fishermen, snarers of birds, hunters, and vine-dressers; also swampy passages before beautiful villas, and women borne by men who stagger under the burden, and other witty things of this nature; finally, views of seaports, everything charming and suitable;” that is to say, of a certain facility and shallowness. The aim was to give an open and cheerful effect, and this could be attained without correct and naturalistic method or unity of idea; on the contrary a fantastic unreality, and even impossibility, was its chief charm, like the painting upon Japanese lacquered wares.
The case was similar with architectural ornamentation, another branch of Roman decorative painting, generally known under the name of the Pompeian style. (Fig. 310.) Even in the time of Augustus, Vitruvius complains of a blind seeking after scenic effect, which, in disdain of all constructive laws, and in a manner quite impossible, piled heavy gables and upper stories upon reed-like columns of no supporting power. His blame, however, seems unjustifiable. That architectural painting which aims at illusion should be condemned as worthless; but this is not the case with that which, after the analogy of conventional landscape-painting, renounces all semblance of reality and assiduously avoids all illusion. Spaces may be apparently extended by an architectural painting which, not deceptively, but poetically, opens the narrow walls of small rooms, and carries the eye dreamily through a wide perspective. Hence the fresh and by no means realistic colors, which, tapestry-like, are not intended to deceive, but to ornament and please. They bear witness to the deep feeling for polychromy, inherited from Hellenic, or at least Hellenistic, predecessors, which was characteristic of the Romans even after their decline. What delight must there have been in a work so extended, and yet free from all slavish copying! Not only Amulius, who, by compulsion, painted the Golden House of Nero, and was celebrated by Pliny for his valuable and finely colored pictures, but countless other artists were everywhere busily employed in covering the walls with paintings and ornaments—a work now intrusted to common decorators. In the time of Nero the activity in ornamental painting, judged by the discoveries among the ruined cities of Campania, must have been greater than has ever been known at any other period.
In the consideration of Hellenic painting, mention has been made of the origin of floor-decorations in mosaic by Sosos at the royal court of Pergamon. By this is only meant mosaic painting with illusory effects, as practised by him; imitations of tapestry patterns and merely ornamental mosaic-work must have been older. His drinking-doves in the “unswept hall” appear to have continued a favorite subject, judging from three well-known imitations; one of which, found upon the Aventine, now in the Museum of the Lateran, bears the inscription of the artist Heraclitos. Though the names of other workers in mosaic are known, they as little deserve mention here as do the numerous vase-painters, their mosaic being almost wholly a technical process; its very laboriousness rendered a truly artistic activity almost impossible. Unfortunately, no name is attached to the most important work of this kind, over four meters long and two wide, apparently representing an Alexandrian battle-scene. This is also the best-preserved historical painting of antiquity, but it is related rather to the Grecian types than to the Roman battle-pieces above mentioned. The greater part of the well-known mosaics, being from Herculaneum and Pompeii, may be referred to the time of Nero; but those of Præneste with the Egyptianized conventional landscapes may date back to the time of Sulla, while the extensive example with figures of athletes from the Baths of Caracalla—now in the Lateran—belongs to the time of that emperor. Many others, however, especially those discovered in the distant provinces, are of later times. Vigorous as are some of the representations of landscapes and of animals among them, it is not to be denied that, as Semper says, mosaic oversteps its boundary in going beyond the patterns of woven tapestry, and trying to make us forget that it is outstretched like a level floor upon which we would walk without hindrance.