It's not really an apt analogy. Law is not a field of inquiry like science, philosophy, mathematics, and theology are. Lawyers do not push the boundaries of understanding, they're clerks. That aside, laws are not divorced from reality, they're agreements that members of a society enter into regarding how the society is supposed to function. To study law is to study the way society works. Yes, society is an artificial construct, which why law is not a field of inquiry, but it still provably exists.