The boundaries of bodies are the least of all things.
Shadows which you see with difficulty, and whose boundaries you cannot define... these you should not represent as finished or sharply defined, for the result would be that your work would seem wooden.
Shadow is the obstruction of light. Shadows appear to me to be of supreme importance in perspective, because, without them opaque and solid bodies will be ill defined; that which is contained within their outlines and their boundaries themselves will be ill-understood unless they are shown against a background of a different tone from themselves.
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