Aesthetic judgements are autonomous, as many other judgements are not: for the latter, but not the former, it is sometimes justifiable to change one’s mind simply because several others share a different opinion. Why is this? One answer is that claims about beauty are not assertions at all, but expressions of aesthetic response. However, to cover more than just some of the explananda, this expressivism needs combining with some analogue of cognitive command, i.e. the idea that disagreements over beuaty can occur, and when they do it is a priori that one side has infringed the norms governing aesthetic discourse. This combination can be achieved by reading Kant’s aesthetic theory in expressivist terms. The resulting view is a form of quasi-realism about beauty. The position has its merits, but cannot ultimately explain the phenomena which motivate it. This conclusion generalises to quasi-realism about other matters.