 Other explananda, on the other hand, may reveal that it is the moral realist who has the extra explaining to do. If moral properties are taken to have an essential normativity—in terms of, say, placing practical demands upon us—then the realist faces the challenge of explaining how any such thing could exist objectively. The moral non-objectivist, by contrast, sees moral normativity as something that we create—that practical demands arise from our desires, emotions, values, judgments, practices, or institutions. Thus the task of providing a moral ontology that accommodates normativity seems a much easier one for the non-objectivist than for the moral realist. (The noncognitivist and the error theorist would seem to have an even easier time, since for them there is no moral ontology at all.)