"Relief sculpture" is sculpture in which the forms or figures are raised above a surrounding flat surface. Such sculpture often is used as architectural ornament, either applied or as an integral part of the structure. When made of concrete, it is frequently cast facedown in "waste molds." Waste molds are destroyed after a single use, being broken up when they are removed from the hardened concrete. Mold fragments can be discarded or recycled. Many professional artists have created major relief sculptures in concrete. Panel sizes range from a few inches to many feet. Because concrete is a relatively inexpensive material, relief sculpture of a smaller scale is well within the scope of most craftspeople. This article explains how to make waste molds from various materials and how to cast concrete relief sculpture in such molds. Practical considerations for sculpture design are discussed, along with selecting materials for the concrete and mixing and casting procedures.