In your sketchbook using 3B graphite pencil or ink, make a series of (10) contour studies; one per page. Choose complex objects like tools, clothing draped over a chair, machined parts, house plants, etc. Try to accent your line quality by employing thicker and thinner, lighter and darker variations as well as "breaks" in the line (lost and found technique). Note the application of the lost and found technique on the interior volumes of the objects above where the side planes meet the top planes. REMEMBER: No Shading!