1. contour line drawing
Unit: Line

3. Contour line: the outline of a figure, body, or mass; a line that represents such an outline; a surface, especially of a curving form
Follows the edges of shapes and clearly defines the various volumes and parts of the whole form; literally, it means “as if traced around with a thread”.
Variation in pressure in response to the nearness or farness of a form from the eye.
The gap between forms: larger = more distance between fore and aft forms.

5. CROSS-COUNTOUR DRAWING:
Lines follow the edges, or contours, and also come through and across the forms.
Accurately records information… not just about the outer edge of a 3-d form but also its inner dimensions.

7. Line qualities:
Tonal variation: use conté or charcoal pencil to practice horizontal and vertical lines in close proximity to one another; vary distance to describe curve of surface
Width of line
Lyrical, fluid line (continuous line is in this group)
Pressure
Discontinuous line