There are 4 main ways to create sculpture: additive, subtractive, modeling, and casting. Sculptors must be proficient at drawing to sketch their sculptures from multiple angles before creating the 3D work. Sculptures can be either relief, viewed from the front, or round, viewed from all sides. An armature provides internal support and saves on materials. Casting involves making a mold before creating the sculpture. Carving is subtractive by removing material like Michelangelo did with marble. Modeling builds up material like clay. The 4 fundamentals of sculpture are form, content, technique, and medium.