Dan Pena has a picture of Adolf Hitler on his wall, but not any old picture. You know, not a simple portrait with Bavarian hills in the background, or a snap of the Führer doting on Helga Goebbels, Joseph’s daughter. No, Pena has a Hitler collage – Nazis marching through Nuremberg, a swastika blotting out the sky, hellfire on the horizon and, the final layer, a red and murderous photograph of the man himself superimposed on to the right-hand side.