 As we noted above, the production of facts by social agents poses no special problem for the naturalist where that production is understood causally, though naturalists of many stripes may want to produce causal models to show how the macro-level social phenomena of interest to many social theorists and social scientists are causally realized given what we know about, e.g. human nature or the causal structure of the universe. In contrast, constitutive claims of construction seem difficult to make sense of (except on an account of construction on which social activity involving a representation comes to produce and causally sustain an object that is referred to by that representation).