  The first line of criticism emerged soon after Moore first offered his Open Question Argument, with philosophers suggesting that in thinking morally we may well not be attributing properties at  all.[9]   Agreeing that it was a mistake to see moral claims as attributing natural properties to things, non-cognitivists argue that Moore's mistake was in thinking that moral claims attribute any sort of property to things, and so he was also wrong in thinking that moral claims have propositional content and express genuine beliefs. The Open Question is always open, they argue, not because we are, in making a moral judgment, attributing some non-natural property to things, but because we are not attributing any property at all. We are not saying anything that might be true or false, nor are we expressing a belief. We are doing something altogether different: taking a stand, or expressing an emotion, or prescribing something. On these views, moral judgments express some attitude other than belief and lack the sort of cognitive content that would allow them to be true or false.