Drawing development: Stages in the representation of a cube and a cylinder

A new schema for defining developmental stages in the drawing of geometrica l objects is proposed, in four studies, (N = 917, 1851, 673, and 437, respe ctively) children and adults drew cubes and cylinders. The data demonstrate that the proposed stages appear in an invariant order: 2-year-old children almost always draw Scribbles; Single Units appear at the age of 3 years, D ifferentiated Figures at the age of 4 years, and integrated Wholes after th e age of 7 years.