In architecture and the decorative arts, a defining, transitional, or terminal element that serves to contour or outline edges and surfaces. The surface of a molding may be plain or modeled with recesses and reliefs, which either maintain a constant profile along its length or are set in rhythmically repeated patterns. Types of flat or angular moldings are the fascia, chamfer (or bevel), and fillet (narrow band). Single curved moldings include the cavetto (concave, with a quarter-circle profile), scotia (deep concave), flute (grooved), ovolo (convex, with a quarter-circle profile), torus (semicircular convex), roll (rounded convex), and astragal (narrow semicircular convex). Among the most common compound moldings are the projecting, double-curved cyma recta or ogee, often used as a crown molding, and the cyma reversa, used for crown or base. The profiles of moldings are traditionally enhanced by flower or leaf forms, geometric motifs, or spirals.