 The main benefit which a fictional approach to possible worlds offers is, of course, the advantage of using the language of possible worlds, without the stiff ontological cost of literal commitment to such worlds. It is an especially tempting account of merely possible objects (like blue swans, or dragons, or the Holy New Zealand Empire): even those who accept some abstractionist account of possible worlds (see van Inwagen 1986) might well be reluctant to accept the literal existence of their contents. After all, it is often thought that the distinguishing mark of merely possible objects is that they do not actually exist.