How did Sumerian artists create composite sculptures from several materials?

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The Great Ziggurat of Ur in Iraq, a massive ancient brick structure with broad staircases and terraced levels, stands alone in a barren landscape. — Mesopotamian art and architecture Ziggurat at Ur (modern Tall al-Muqayyar, Iraq), constructed c. 2100 bce.

Sumerian artists developed composite sculptures primarily as a creative response to the scarcity of stone in the region. By utilizing a variety of materials, they achieved high levels of technical refinement and artistic expression.1

The creation of these figures involved several key methods:

Structural Assembly: Sculptors often combined different materials to form a single figure. For instance, a life-size statue might feature a limestone face with the remainder of the body constructed from other, unspecified materials, utilizing visible attachment devices to join the components.1
Inlay and Enrichment: Craftsmen frequently decorated wooden or bitumen cores with precious materials. Notable examples include bull heads on harps, which were covered in gold and adorned with lapis lazuli beards, or figures of animals cast in electrum and mounted on bronze bases.1
Surface Decoration: The use of delicate inlay—such as shell and semiprecious stones—was a hallmark of the period, particularly in the creation of elaborate panels and decorative objects.1
Metalwork Integration: Beyond casting, artists integrated metalwork into composite designs, combining gold, silver, and bronze to enhance the detail and prestige of their work.1