Borders define territories within which identities and order are described and delineated. The triptych of indentities, borders and orders is central to understanding the nature of sovereignty and the relations between countries. Nowhere is this more apparent than in the European Union. The changing definition and placement of the border is one of the most striking features of the recent transformations of the Union. The definition of what a border is and where it is for persons has moved out of the territory of national sovereignty and has become the preserve in law of the European...