 It is also significant that not all social kinds are obviously social. Sometimes it is assumed that the conditions for membership in a kind concern only or primarily biological or physical facts. Pointing out that this is wrong can have important consequences. For example, the idea that whether or not a person is white is not simply a matter of their physical features, but concerns their position in a social matrix, has been politically significant, and to many surprising. How should we construe the constructionist project of arguing that a particular kind is a social kind? What could be interesting or radical about such a project?