 Hutcheson’s response was to point out that even if moral sense can mislead, it doesn’t follow that reason is needed to provide a standard for it, or that it’s capable of doing so. After all, it’s not by reasoning that we fundamentally correct mistakes of colour perception. Rather, we try to ascertain which circumstances are conducive to properly functioning perception (perhaps by way of an a priori inquiry) and then try to place ourselves in such circumstances and look again. What the suitable circumstances in the moral case are like depends on the nature of moral facts. For relativists like Prinz (2007), the only thing that matters is that our reactions genuinely reflect our sentiments towards the action. For ideal dispositionalists, David Lewis offers a basic recipe: