Systems of Perspective
		Implied orthogonal lines extend from viewer point of view through the edges of established planes to create the illusion of distance and space, converging to a vanishing point placed on the horizon; dividing the planes into ground and sky.
	One Point Perspective: A single point is placed on the horizon line and all the lines of objects at right angles to the plane angle off toward that point: the object drawn appears parallel with the picture plane.
	Two-Point Perspective: A scene or object viewed from an angle which is not parallel to the picture plane: the edges recede to two divergent points on the horizon line.
	Multi-Point Perspective: An object is angular but also recedes upward or downward in space in relation to the horizon line.