Can serve to mark the two ends of a line, the intersection of two lines, the meeting of lines at the corner of a plane or volume, the center of a field
Can join, link, support, surround, or intersect other visual elements, describe the edges of and give shape to planes, articulate the surfaces of planes
Vertical line can express equilibrium, symbolize the human condition, or mark a position in space, horizontal line can represent stability, the ground plane, the horizon, or a body at rest, oblique line is dynamic and visually active