The line is always diameter, thus circumference, of a circle. Thus the graph articulates rotation. The slope at every intersection is always zero. Thus, the slope from intersection-to-intersection is always one. Thus, perspective is conserved as duplication is the basis for unification, and vice versa. This is the basis for movement (absolute zero, perpetual motion). At any intersection, a hidden 50-50 circle. The line conserves a circle and vice versa.