Quotation

The pen is therefore both the first, and best instructive, and has then (as all the other kinds) attain’d its desired end, when it so deceives the eye by the Magic, and innocent Witch-craft of lights and shades, that elevated, and solid bodies in Nature, may seem swelling, and to be embossed in Plano, by Art.
To arrive at this, you must first draw the exact lineaments, and proportion of the subject you would expresse in profile, Contours and single lines only ; and afterwards, by more frequent, and tender hatches in the lighter places, strong, bold, or cross in the deeper.

Conceptual field(s)