I've been looking the effect of using a 2-dimensional shape to create the illusion of a 3-dimensional image. "Perspective" in the graphic arts, such as drawing, is an approximate representation, on a flat surface, of an image as it is seen by the eye. The two most characteristic features of perspective are that objects are drawn:
/Smaller as their distance from the observer increases
/Foreshortened: the size of an object's dimensions along the line of sight are relatively shorter than dimensions across the line of sight
