The act of representing something by line, etc.
Highly recommended are the books by Betty Edwards. Her method of drawing and teaching was revolutionary when she published it in 1979. It received an immediate positive response, and is now widely accepted by artists, teachers, and others around the world. Underlying the method is the notion that the brain has two ways of perceiving and processing reality – one verbal and analytic, the other visual and perceptual. Edwards’ method advocates suppressing the former in favor of the latter. It focuses on disregarding preconceived notions of what the drawn object should look like, and on individually “seeing”.