The moment we have a line, we get as above, so below, go right or left hemisphere. On this side of a river or on the other.
The moment we have a curve, we get an inside out and outside in, the peak and the valley, a shelter and a cup. The moment we have a line caught its tail, we get a form, that gives a figure and a background, the living dead and the dead that keep on living. As you read this, the meaning is a figure and your big toe is the background. Also, the movement of lines of letters, of gestures of the bodies and their dance is probably a background too. If we take three letters, such as L or S or B and pay attention to the stories of lines and the lines in a story, we just might carry across and start taking metaphorical truths literally.