It is another rainy day in Pyongyang and the long boulevards of utilitarian buildings have taken on a misty shade of grey. School children do daily exercises before saluting a portrait of Kim Jong-un and adults don lapel pins depicting their leader before a day’s work at the farm or factory. Tracing a form of cultural uniformity that is unfamiliar to many in the West, this is a portrait of life behind the world’s last iron curtain.