Meta Ontology

Peter Forrest and D.M. Armstrong have given an argument against a theory of naturalness proposed by David Lewis based on the fact that ordered pairs can be constructed from sets in any of a number of different ways.1. I think the argument is good, but requires a more thorough defense. Moreover, theargument has important consequences that have not been noticed. I introduce a version of Lewis's proposal in section one, and then in section two I present and defend my version of the argument. After addressing a worry about my argument in section three, in section four I argue that a similar ''argument from arbitrariness'' jeopardizes Lewis's solution to the Kripke/Wittgenstein puzzle of the content of thought.