For the past two decades, you could cross the border between Northern Ireland and the Republic half a dozen times without noticing or, indeed, turning off the road you were travelling. It cuts through fields, winds back-and-forth across roads, and wends from Carlingford Lough to Lough Foyle. It is frictionless - a feat sealed by the Good Friday Agreement. Before that, watchtowers loomed over border communities, military checkpoints dotted the roads, and smugglers slipped between jurisdictions. This is a past that most are happy to have left behind but might it also be the future?
The border has been a topic of dispute for over a century, first in Dublin, Belfast and Westminster and, post Brexit referendum, in Brussels. Yet, despite the passions of Nationalists and Unionists in the North, neither found deep wells of support in the countries they identified with politically.