Form is the shape that the expression of content takes. It is the shape, structure, configuration or essence of something. Line Is an element, usually drawn or painted, that defines shape with a continuous mark. The movement of viewers eyes over the surface of the work of art may follow a path determined by the artist and so create imaginary lines. It is a path of a point moving in space or the track of a motion.
Artists use line to outline shapes, to evoke forms and movement, and to imply solid mass.
Lines may be light and slender or dark and thick. Lines may be perceived as tentative, elegant, assertive, forceful or even brutal. Psychological responses are attached to the direction of a line. Vertical lines are active. Horizontal lines are passive.