Perspective is the representation of objects on the basis of how they may appear in real-life. Perspective is an approximate representation, generally on a flat surface, of an object as it is seen by the eye. Perspective is useful for representing a three-dimensional scene in a two-dimensional medium, like paper. It is based on the optical fact that for a person an object looks N times smaller if it has been moved N times further from the eye than the original distance was.