To reduce the two types of rule in this way to a single type would, however, obscure their character and subordinate what is of central importance in the game to what is merely ancillary. It is worth considering how far the reductionist legal theories, criticized in this chapter, similarly obscure the diverse functions which different types of legal rules have in the system of social activity of which they form part.

H. L. A Hart, The Concept of Law, loc. 649