The changing economic fortunes of both the Republic of Ireland (the South) and Northern Ireland (the North) since 2007 have had a significant effect on the everyday geographies of people living on both sides of the Irish border. This chapter explores the ways in which socio-economic change can influence how people conceptualise and negotiate a political border that has become increasingly permeable. It begins with a brief discussion of the meaning and significance of national boundaries before moving on to document the ebb and flow of movement across the Irish border since its creation in 1920. The chapter reviews the economic tipping point and its impact on cross-border mobility. It discusses some of the issues surrounding the everyday geographies of trans-border communities. The chapter concludes with a discussion of the permeability of the border and its ramifications for the relationship between the two parts of the island of Ireland.