Line: A visual element of length. It can be created by setting a point in motion. It is the most common design element.

Line Quality: Any one of a number of characteristics of line determined by its weight, direction, uniformity, or other features.

Contour: Shapes bounded or bordered by line, an outline.

Cross Contour: Lines that reveal the form and volume of a shape or object.

Gesture: Lines describe what an object is doing rather than what it looks like. Describing the shape is less important than showing the dynamics of the subject.

Inherent Line: A series of lines tied to the geometry of shapes.

Implied Line: An invisible line created by positioning a series of points so that the eye will connect them and thus create movement across the picture plane.

Psychic Line: A mental connection between two points or elements. This occurs when a figure is pointing or looking in a certain direction, which causes the eye to follow toward the intended focus.

Value: A measure of relative lightness or darkness

Lost-and-Found Contour: A description of a form in which an object is revealed by distinct contours in some areas, whereas other edges simply vanish or dissolve into the ground.

Hatching/Cross Hatching: Placing a series of lines close together to build up value.