Well, it's not "bound" to it. One of the more important tasks in art is to learn that any "meaning" of a line, a drawing, whatever, is quite arbitrary and mostly depends from circumstances quite far away from the actual line.a line is not a line it has additional meaning which is bound to it
But I think we can end this discussion here and maybe just agree to disagree. As a personal hint: I don't see as much "meaning" in anything as other people seem to do.