The shadow of a person is cast onto the exact spot where the County Louth (bottom) in the Irish Republic meets County Armagh (top) in Northern Ireland, 26 May 2018. Only the different shade of road tar is all that marks the border from the two parts of the Island of Ireland. Northern Ireland parties opposed to Brexit have said it is “critical” there is no hard border, in order to protect the “hard won peace”. Photo/Paul McErlane