Contour drawing, is an artistic technique used in the field of art in which the artist sketches the contour of a subject by drawing lines that result in a drawing that is essentially an outline; the French word contour meaning, “outline.”  The purpose of contour drawing is to emphasize the mass and volume of the subject rather than the detail; the focus is on the outlined shape of the subject and not the minor details. However, because contour can convey a three-dimensional perspective, length and width as well as thickness and depth are important; not all contours exist along the outlines of a subject. This technique is manifested in different styles and practiced in the honor of drawing development.
Using a pencil on paper, Carl Krull draws line-by-line like an Inkjet printer. The third image within post is done with a tube and rotating technique while he sits in a moving car, which you can view below. “Every line has its own characteristic, but still corresponding and relating to the previous line. Eventually every bump in the road and every tiny crack in the floor affects the drawing, and it becomes a topographical map of the journey itself,” he comments.