 Much of contemporary ontology builds on the assumption that existence is to be understood in terms of quantification: in a slogan, to exist is to be something. Ontology is largely concerned with the domain of the existential quantifier. This assumption can be traced back to the work of Frege and Russell, both of whom analyzed quantification in terms of predication, and plays a crucial role in Quine’s admonition to transform ontology into the study of the ontological commitments of our global theory of the world regimented in the language of quantificational logic and identity.