 Third, Lewis offers an account of how facts about everything else reduce to the sorts of facts laid out in his accounts of fundamental ontology and modality. (Note that given the remarks in the last paragraph, these reductions ultimately rest on facts about fundamental ontology alone; no unanalyzed modal notions are involved in them.) Better: he offers an assortment of distinctive approaches for constructing such reductions, of which there are many examples but no single, canonical exposition. At this point I wish to make just three observations about these strategies. First, they can be seen to be directed at providing answers to a distinctively metaphysical kind of question, of the form, “What is it for such-and-such a fact to obtain?” Examples will pin down the idea: