Perspective in the graphic or mural arts, such as drawing, is an approximate representation on a flat surface (such as paper) of an image as it is perceived by the eye. The two most characteristic features of this representation are these:
* Objects are drawn smaller on the drawing as their distance from the observer increases
* Spatial foreshortening, which is the distortion of items when viewed at an angle.
In art, the term "foreshortening" is often used synonymously with perspective, even though foreshortening can occur in other types of non-perspective drawing representations (such as oblique parallel projection).
Producing a perspective drawing on a flat surface, whether sketched or calculated, is always an approximation. It necessarily incurs some distortion from what would be perceived by the eye due to the nature of the geometric transforms involved. . Wikipedia