I literally drew on the walls of the trailer, mocked it up in cardboard, we'd come in and cut, decide things were wrong, pull it out, put it back in.

Protesters also created a 'face in the hole' cardboard cutout where any supporter of the protests can get their photo taken in the role of 'slingshot bombardier'.

The visit began with military jeeps escorting our convoy into North Korean territory. The vehicles number plates were covered with white cardboard, and red flags had been affixed to the doors next to the side view mirrors for which none of our South Korean hosts was able to offer an explanation.