antecedents of Roman art were legendary. In the mid-5th century BC, the most famous Greek artists were Polygnotos, noted for his wall murals, and Apollodoros, the originator of chiaroscuro. The development of realistic technique is credited to Zeuxis and Parrhasius, who according to ancient Greek legend, are said to have once competed in a bravura display of their talents, history's earliest descriptions of trompe-l'œil painting. In sculpture, Skopas, Praxiteles, Phidias, and Lysippos were the foremost sculptors. It appears that Roman artists had much Ancient Greek art to copy from, as trade in art was brisk throughout the empire, and much of the Greek artistic heritage found its way into Roman art through books and teaching. Ancient Greek treatises on the arts are known to have existed in Roman times, though are now lost. Many Roman artists came from Greek colonies and provinces. The high number of Roman copies of Greek art also speaks of the esteem Roman artists had for Greek art, and perhaps of its rarer and higher quality. Many of the art forms and methods used by the Romans – such as high and low relief, free-standing sculpture, bronze casting, vase art, mosaic, cameo, coin art, fine jewelry and metalwork, funerary sculpture, perspective drawing, caricature, genre and portrait painting, landscape painting, architectural sculpture, and trompe-l'œil painting – all were developed or refined by Ancient Greek artists. One exception is the Roman bust, which did not include the shoulders. The traditional head-and-shoulders bust may have been an Etruscan or early Roman form. Virtually every artistic technique and method used by Renaissance artists 1,900 years later had been demonstrated by Ancient Greek artists, with the notable exceptions of oil colors and mathematically accurate perspective. Where Greek artists were highly revered in their society, most Roman artists were anonymous and considered tradesmen. There is no recording, as in Ancient Greece, of the great masters of Roman art, and practically no signed works. Where Greeks worshipped the aesthetic qualities of great art, and wrote extensively on artistic theory, Roman art was more decorative and indicative of status and wealth, and apparently not the subject of scholars or philosophers. Owing in part to the fact that the Roman cities were far larger than the Greek city-states in power and population, and generally less provincial, art in Ancient Rome took on a wider, and sometimes more utilitarian, purpose. Roman culture assimilated many cultures and