  Poincaré’s geometric conventionalism contrasts the conventional with the truth-evaluable. According to Poincaré, there is no underlying fact of the matter about the geometry of physical space, so geometric axioms are not evaluable as true or false. Rather, the choice of an axiom system is akin to the choice of a measuring standard, such as the metric system. In many conventionalist theories, however, the idea is that our conventions somehow make certain facts true. Those facts may be “conventional”, “social,” or “institutional” rather than “brute” or “natural,” but they are full-fledged facts nonetheless. For instance, following Hume, it seems plausible to claim that property rights and monetary value are due largely to convention. Yet few philosophers would hold that claims about property rights or monetary value are  non-truth-evaluable.[2] As this example illustrates, conventionalism need not reflect an “anti-realist” or “deflationary” stance towards some subject matter.