alike as manual labourers. At the same time, the level of skill required to produce quality work was recognized, and even considered a divine gift. Portraiture Portraiture, which survives mainly in the medium of sculpture, was the most copious form of imperial art. Portraits during the Augustan period utilize youthful and classical proportions, evolving later into a mixture of realism and idealism. Republican portraits had been characterized by a "warts and all" verism, but as early as the 2nd century BC, the Greek convention of heroic nudity was adopted sometimes for portraying conquering generals. Imperial portrait sculptures may model the head as mature, even craggy, atop a nude or seminude body that is smooth and youthful with perfect musculature; a portrait head might even be added to a body created for another purpose. Clothed in the toga or military regalia, the body communicates rank or sphere of activity, not the characteristics of the individual. Women of the emperor's family were often depicted dressed as goddesses or divine personifications such as Pax ("Peace"). Portraiture in painting is represented primarily by the Fayum mummy portraits, which evoke Egyptian and Roman traditions of commemorating the dead with the realistic painting techniques of the Empire. Marble portrait sculpture would have been painted, and while traces of paint have only rarely survived the centuries, the Fayum portraits indicate why ancient literary sources marvelled at how lifelike artistic representations could be. Sculpture and sarcophagi Examples of Roman sculpture survive abundantly, though often in damaged or fragmentary condition, including freestanding statues and statuettes in marble, bronze and terracotta, and reliefs from public buildings, temples, and monuments such as the Ara Pacis, Trajan's Column, and the Arch of Titus. Niches in amphitheatres such as the Colosseum were originally filled with statues, and no formal garden was complete without statuary. Temples housed the cult images of deities, often by famed sculptors. The religiosity of the Romans encouraged the production of decorated altars, small representations of deities for the household shrine or votive offerings, and other pieces for dedicating at temples. Elaborately carved marble and limestone sarcophagi are characteristic of the 2nd to the 4th centuries with at least 10,000 examples surviving. Although mythological scenes have been most widely studied, sarcophagus relief has been called the "richest single source of Roman iconography," and may also depict the deceased's occupation or life course, military scenes, and other subject matter. The same