 This combination is supposed to be difficult for the realist to explain. For (2) seems to show that there is no conceptual link between ethical concepts like ‘wrong’ and any one of our naturalistic concepts. And if ethical concepts function to pick out properties (as the realist claims), then given this conceptual separation, it seems that we should be able to identify conceptual possibilities by arbitrarily “mixing and matching” distributions of naturalistic and ethical properties. Ethical supervenience precisely functions to limit such mixing and matching.