Ethical ideas are normative, or at least we take them to be so. This means they must serve as a standard for action. To say they are a standard for action is to say they command us both to imagine how the world could be different, better, than it is, and to try to transform it to align with these imaginings. To demand such a thing, ethical commands must be violable. If the world can’t be otherwise than it is, if we can’t even imagine how it ought to be, there could be no stan