 Third, the phenomenon of language relativity (in the technical sense discussed in §1) has led many philosophers, including Geach, to the view that ideology creates ontology. There is no antecedently given domain of objects, already individuated, and waiting to be described. Instead, theories carve up the world in various ways, rendering some things noticeably distinct and others indiscernible, depending on a theory’s descriptive resources. The very notion of object is theory-bound (Kraut 1980). This sort of anti-realism may seem to go hand in hand with relative identity. Model theory, however, is realist to its core and language relativity is a model-theoretic phenomenon. It is a matter of definability (in a structure). Referring back to §1, in order to make sense of language relativity we have to start with a pair of distinct objects, \(a\) and \(b\), (distinct from the standpoint of the metalanguage), and hence a pair of objects we assume are already individuated. These objects, however, are indistinguishable in \(M\), since no formula of \(L'\) defines a subset of \(M\) containing the one object and not the other. When we move to \(M'\), we find that there is a formula of the enriched language that defines such a subset in \(M'\). Thus, language relativity is not really any sort relativity of identity at all. We must assume that the objects \(a\) and \(b\) are distinct in order to describe the phenomenon. If we are living in \(M\), and suspect that Martians living in \(M'\) can distinguish \(a\) from \(b\), our suspicion is not merely to the effect that Martians carve things up differently than we do. Our own model theory tells us that there is more to it than that. Our suspicion must be to the effect that \(a\) and \(b\) are absolutely distinct. If we are blind to the difference between \(a\) and \(b\), but the Martians are not, then there must be a difference; and even if we are living in \(M\), we know there’s a difference, or at least we can suspect there is, since model theory tells us that such suspicion is well founded.