These are two exercises on how to formulate proper geometric perspective when you are presented with incomplete data. You take what perspective you can from the plan and then fill in the missing details by using educated guesses. It's been my experience that even beginner artists can estimate perspective to within ninety percent accuracy. My trained eye normally achieves maybe up to ninety-five percent, but for true draftsmanship you need absolutely solid geometry, something that has eluded me ever since I started to draw. So: exercises to gain proficiency. Hockey players take drills, basketball player work on free throws, and artists fill sketchbooks.
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