Final answer:
Hierarchical scale is utilized in Benin royal altar art to emphasize sacred kingship, showcasing hierarchy through scale differences.
Explanation:
Hierarchical scale is the feature used in art from Benin royal altars to support the concept of sacred kingship, as seen in the altar dedicated to King Ovonramwen. This feature was utilized to convey hierarchy, with larger scale figures representing greater importance, such as the king portrayed at a significant scale compared to other figures present.
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