For this exercise, I set a group of books on the coffee table, and arranged them corner on.
I chose different sized books and stacked them, a little haphazardly.
I drew in pencil, paying attention to angular perspective.
I extended the lines towards the vanishing points, which were all off the edges of the page. There were multiple vanishing points as the books were not stacked in a straight manner.
It is very difficult to visualise where the vanishing points will meet at eye level, unless you have an enormous piece of paper and a very long ruler! But the lines extended very subtly for this task.