USE OF DECORATIVE SCULPTURE IN ROMAN ARCHITECTURE: THE ARCH OF CONSTANTINE.
Roman architecture may be considered really as a transitional style. While its true constructive characteristic is the round arch, every detail of the Greek or Lintel architecture is used both without and with the arch, and in the latter case the column frequently becomes a wall decoration in the shape of a pilaster, as well as the cornice, and is no longer made use of, as in true lintel construction, to support the weight of the roof. In their viaducts and bridges and baths they were great builders with the arch, but, like some modern engineers, when they wanted to beautify they borrowed architectural ornament from the Greeks.
Nothing very fresh was gained for design in these adaptations except a certain heavy richness of detail in the sculptured cornices and friezes, and coffered ceilings. The use of the flat pilaster, however, led to the panelled pilaster with its elegant arabesque, which was afterwards revived and developed with such extraordinary grace and variety by the artists of the Renascence and carried from Italy westward.
With the round arch, too, several important decorative spaces were given to the designer, the spandrel, the panel, the medallion, all of which, with the frieze, may be seen utilized for the decorative sculpture on the arch of Constantine. The decorative use of inscriptions is also a feature in Roman architecture, and the dignity of the form of their capital letters was well adapted to ornamental effect in square masses upon their triumphal arches and along the entablature of their temples.
The Romans, too, brought the domed roof and the mosaic floor into use, and were great in the use of coloured marbles; also stucco and plaster work in interiors, the free and beautiful plaster work found in the tombs on the Latin Way being well known; so that on the whole we owe to them the illustration of the effective use of many beautiful arts, which the Italians have inherited to this day, though it must be said often with more skill than taste.
One might say, generally and ultimately, Roman art exemplified that love of show, and the external signs of power, pomp, splendour, and luxury which became dear as well as fatal to them, as they appear to do to every conquering people, until they are finally enervated and overcome as if by the Nemesis of their own supremacy.
MOSAIC, ST. APOLLINARE IN CLASSE, RAVENNA.
The art of Greece, one may say, on the other hand, at her zenith represented that love of beauty as distinct from ornament, and clearness and severity of thought which will always cling to the country from whence the modern world derives the germ of nearly all its ideas.