Sculpture is a 3D art form that can take many forms, including: sculpture in the round (freestanding), relief (projecting from a background), modeling (building up material), carving (subtracting material), casting (reproducing in another material), construction/assemblage (multiple parts), and kinetic (moving) sculptures. Sculptures can also incorporate mixed media, installations, and site-specific works. Common sculptural materials include stone, metal, wood, clay, wax, and new plastics or resins.