Three-dimensional form, often implying bulk, density and weight<br><br> Shapes or forms used in visual art, as contrasted with lines; also masses often form the large part(s) of the compositional structure, without the additional complexity of detail.<br><br>Refers to the effect and degree of bulk, density, and weight of matter in space; the area occupied by a form such as a building or sculpture. As opposed to plane and area, mass is three-dimensional.Works that makes the viewer aware of its mass, and and the massing of its parts:Mesopotamia, Weight in the Shape of a Sleeping Duck, c. 2000