The additive processes of sculpture include casting, modeling and assembling. The art of sculpture mainly comprises of four primary techniques. These techniques are either additive, which means that a material is added to the sculpture, or subtractive, which requires that a material is removed from the sculpture.
Using the additive process of casting, a cast is made with a mold, where a material such as metal is added to the mold and allowed to cool down. On the other hand, modeling involves the addition of a soft and pliable material, such as clay to create a shape. Assembling necessitates that different materials are linked to create a sculpture.