Mesopotamian religion recognizes literally thousands of deities, and distinct iconographies have been identified for about a dozen. Less frequently, gods are identified by a written label or dedication; such labels would only have been intended for the literate elites. In creating a religious object, the sculptor was not free to create novel images: the representation of deities, their attributes and context were as much part of the religion as the rituals and the mythology. Indeed, innovation and deviation from an accepted canon could be considered a cultic offense. The large degree of similarity that is found in plaques and seals suggests that detailed iconographies could have been based on famous cult statues; they established the visual tradition for such derivative works but have now been lost. It appears, though, that the Burney Relief was the product of such a tradition, not its source, since its composition is unique.