The plastic (from the Greek plassein/plattein, “to form,” and plastikos, “malleable”; Latin plasticus) art of sculpture by modeling (Sculpture, techniques of) involves making works from malleable (clay, wax, papier maché, stucco, plaster of Paris) or castable materials (metals and other malleable materials that can be made by processes of casting and pouring, e.g. concrete or porcelain). Sculpture by modeling, which builds up material, contrasts with subtractive sculpture, w…