 The specific issue framed in B66 is how, assuming that oxen and horses are indeed different kinds, we can specify distinguishing features to differentiate them  reliably.[17]  But the Mohists’ rejection of “wild presenting” raises a more general issue. What determines the distinctions between kinds, such that citing some features is “wild” and others not? Instead of distinguishing oxen from horses, could we instead group hornless oxen and horses together as a kind? The Mohists’ implicit view seems to be—though the textual evidence is sparse and open to competing interpretations—that the difference between kinds such as oxen and horses lies in distinctive similarities shared by members of each kind that are inherent in their shí 實 (stuff), obtaining independently of human activity. Hence kind relations are determined by the natural world, not by human attitudes or conventions. Which kind distinctions we attend to and employ may be up to us, but that some group of things forms a kind is not. In seeking to distinguish kinds, then, our task is to identify features that allow us to recognize the inherent differences between them reliably.