
In the previous guide we made a three dimensional rectangle using a vanishing point. (see guide link, if you have not read it)
Any rectangle drawn, any place on the paper, is made 3d the same way,
by connecting lines (called orthogonal lines) from its corners to the vanishing point (on the horizon line)
and then connecting the orthogonal line with horizontal and vertical lines (called transversal lines.)
This solid 3d rectangle is to the left side and below the horizon line.
It is below our eye level and to our left.
We see only the side parallel to our face and it’s top and right side.