Mackie agrees that when we make moral judgements, what we"re really doing is just expressing attitudes. But doesn"t think we know we"re doing that we think we re ascribing non natural properties of goodness/rightness. But since there aren"t any such properties moral judgements are all false. Thinks moore is right about what we think we"re doing in making moral judgments (ascribing special moral properties) but expressivism is right about what we"re really doing (expressing attitudes) Error theory says all moral judgments are false they make a claim about the world that isn"t true. 2 sides of mackie"s view come together in idea that we project/objectify our moral attitudes (251) General idea here is that we have something inside us & we assume there must be something outside in the world that corresponds to it. Ex. colour have certain reddish/bluish sensation in minds, caused by external object feature of its surface. Assume that same reddish/bluish quality must belong to object as.