Whatever their areas of expertise, all museum curators know about classification. Categorising and classifying individual items is how collections are created and sense is made from an array of artefacts. In this way, systems of knowledge are created. In natural history especially, classificatory activities usually follow a scientific method begun by the Swedish naturalist Carl Linnaeus. But what if one were to skew things a bit? The Argentine novelist Jorge Luis Borges once imagined a world in which animals were classified as either belonging to the emperor or not. It's between these two worlds that the American artist Mark Dion operates.