Basic Drawing Made Amazingly Easy (Made Amazingly Easy Series)

1. New vanishing line


2. Now we’re going to draw the bottom two lines of the box. These
   lines begin at the same vanishing points, left and right, crossing at the
   bottom tip of the vertical line.


3. New vanishing line


4. Add two more vertical lines on either end to define the dimensions
   of the box.

Erase your guidelines, and you have a box in two-point perspective,
where the bottom of the box falls below the horizon line. Note that by
using this technique, the effects of perspective are more apparent.