Hi Ken,
I am, by no mean, interested in oversimplifying things. But I insist that you can draw anything by looking through an imaginary frame from a particular viewpoint. Just try it!
When I draw, I control my drawing by comparing the angles with the vertical and horizontal of the drawing paper.
Next, I often draw life size, to bee another control funktion .
This, of cause, are technical things that have to bee understood before you can take the advantage of them.
There are many topics that deal with these matters.
Ken, I am aware that you are the one that just asked the question, but I prefer to answer as precise and direct as I can.
Allan
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