One of the most radical areas of thought affected by cognitive science has concerned the fundamental issue of categorisation. The way that we divide the world up and name it to ourselves determines what we think the world is, and, even more importantly, how we think that we think at all. Suggesting a new understanding of categorisation is therefore not a trivial undertaking. What cognitive science proposes is not simply a different pattern for categorising mind, body, language and thought, but a revolutionary re-cognition of the notion of categorisation itself.