 Finally, there is a fourth presentist solution worth discussing, which also has a modal analog not discussed in the previous section. One might insist that, although Socrates does not exist, Socrates is nonetheless a constituent of reality, in the range of the most unrestricted of quantifiers and available as a constituent of singular propositions. This is because there are entities that do not exist. This form of Meinongian presentism, according to which everything that exists at all presently exists, although there are things that do not presently exist and so do not exist at all, has been defended by Mark Hinchliff (Hinchliff 1988; 1996). Many find the distinction between being and existing obscure and the Meinongian metaphysics incredible, but the view promises a solution to the problems similar to possibilist and contingent concreteness solutions but with an alternative metaphysics. (For further discussion of eternalism and presentism, see the entries spacetime: being and becoming in modern physics and time. For discussion of Meinongianism, see existence and nonexistent objects.)