How do borders relate to questions of identity? What can we learn from thinking of Europe as a "made-up continent"? And what is the analytical power of maps? On this episode of The UK in a Changing Europe podcast, Professor Sarah Hall talks to Jonn Elledge, author of 'A History of the World in 47 Borders' and Lewis Baston, author of 'Borderlines: A History of Europe, Told from the Edges' about these questions.