Reliefs

A type of sculpture in which forms projects from a background. There are three degrees or types of relief: high, low, and sunken. In high relief, the forms stand far out from the background. In low relief (best known as bas-relief), they are shallow. In sunken relief, also called hollow or intaglio; the backgrounds are not cut back and the points in highest relief are level with the original surface of the material being carved. (Artlex.com)

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