Sculptures are either in the round or in relief and refer to an artist's work done in three dimensions. Sculptures can be carved; they can also be created from nothing but the raw materials by molding an artwork from clay as in a relief, Carving and molding are two independent, yet complimentary, forms of sculpture. Direct carving is thought by some to be a higher form of sculpture than molding; however, many fine sculptures have been achieved by the process of molding either clay or wax initially, with the final work being transferred to bronze, plaster, lead or stone.
In sculpture the three-dimensional aspect is very important, as opposed to painting which can only be done in two-dimensional form. However, the painter may use certain techniques in order to give the effect of three-dimensioning.