Perspective establishes the viewer's position and location within the picture plane while creating the illusion of three-dimensional depth on a flat, two-dimensional surface.
THE RULES OF PERSPECTIVE
1. Perspective is established from a fixed point of view. Therefore, the artist must be stationary.
2. Diagonal, parallel lines will converge at a point (called the vanishing point) located on the horizon line (a.k.a. eye level). Note: vanishing points are always on the horizon line. In addition, the horizon line or eye level moves with you. If you turn your head left or right, up or down as well as tilted then you will move your horizon line/ eye level correspondingly.
3. Objects equal in proportion will appear to diminish in size as they recede into space. This is true of the negative areas as well.
There are two extreme views of perspective: 1. the "bird's eye" view; objects seen from above. and 2. the "bugs eye" view; objects seen from below.
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