The document discusses the use and definition of shapes in art. It defines shape as an area distinguished by boundaries or differences in value, color or texture. Shapes can be actual, implied or amorphous. Artists use shapes to suggest forms, create illusions of mass and volume, and guide viewer attention. Shapes are two-dimensional planes or three-dimensional masses and volumes. Principles of design like balance, direction, dominance and harmony can be achieved through purposeful manipulation of shapes.