  This question may be interpreted in different ways. We might emphasize the immediate relevance of moral properties for our motivation to act, contrasting it with the merely indirect relevance of natural properties. This interpretation, however, would take us back to the debate between internalists and externalists that we have already explored. A quite different interpretation focuses on the perceived role of moral properties in moral reflection and judgment from the perspective of someone engaged in moral reflection and judgment. Two cases are particularly relevant. Suppose, to take Harman’s example, that I suddenly see hoodlums setting a cat on fire (Harman 1977). I may form an immediate judgment, without any conscious reflection, that what they are doing is wrong. In another case I may find myself perplexed about whether euthanasia is wrong and begin to reflect on why I should regard it one way or another. Each case presents an apparently strong contrast to the style of thinking that engages me if I were suddenly to recognize the presence of a cat or were to reflect on whether a certain contested property of a natural system really exists. Let us explore these cases in turn.