The illusion of three-dimensional drawings lie in the use of isometric perspective, in which the artist uses parallel lines and congruent angles to depict geometric objects. The eye tends to introduce incongruities in perspective, such as the way in that a straight road appears to narrow as it stretches away from the viewer. Isometric perspective, however, adheres to the true specifications of the object, portraying uniformity where the eye would suggest otherwise. The fantastic illusion of depth in these illustrations can be further enhanced with the use of color or shading to fool the eye and captivate the mind. These 31 amazing images can be colored to emphasize their solidity or shape; they can also be copied, expanded, or used as a source of graphic and design inspiration. They are a wonderful and fascinating way for young and old alike to study geometrical perspective or color creatively. Read Less