TWO POINT PERSPECTIVE
In two point perspective the sides of the object vanish to one of two vanishing points on the horizon. Vertical lines in the object have no perspective applied to them.
The illustration to the left demonstrates the how to draw a box in two point perspective.
1.) Put two vanishing points at opposite ends of the horizontal line.
2.) Draw in the front vertical of the box. Drawing the line below the horizontal will create a view which we are looking down on. To look at the object from below, draw the front vertical above the horizontal.
3.) Draw lines from the top of the vertical which disappear back to both of the vanishing points. Repeat the process for the bottom of the line.
4.) To complete both of the sides by drawing in the back verticals.
5.) To draw the top of the box, draw lines from the back verticals to the opposite vanishing points.
By altering the proximity of the vanishing points to the object, you can make the object look big or small.