Because women were normally portrayed clothed in art, bared breasts can signify vulnerability or erotic availability by choice, accident, or force. Baring a single breast was a visual motif of Classical Greek sculpture, where among other situations, including seductions, it often represented impending physical violence or rape. Some scholars have attempted to find a "code" in which exposing the right breast had an erotic significance, while the left breast signified nurturing. Although art produced by the Romans may imitate or directly draw on Greek conventions, during the Classical period of Greek art images of women nursing were treated as animalistic or barbaric; by contrast, the coexisting Italic tradition emphasized the breast as a focus of the mother–child relationship and as a source of female power.