Holdengräber reminded him of the dictum, attributed to Blaise Pascal, that opens Lessons of Darkness, Herzog’s 1992 documentary: “The collapse of the stellar universe will occur – like creation – in grandiose splendour.”

Herzog repeated it. He said, “Actually, Pascal didn’t write that. I wrote that.”

Holdengräber said: “But it sounds so very like Pascal.”

“Pascal should have written it,” Herzog said, of the 17th-century philosopher. “That’s why I signed his name.”

At the turn of the millennium, Miller and Varley were working on their long-awaited Dark Knight sequel. It was initially hatched as a romp, a reinjection of Day-Glo fun into what had become a relentlessly grim superhero landscape. They were about halfway through the series on September 11, 2001. By this time Miller had moved back to New York, and the assault on his home disturbed him deeply-which again quickly became apparent in his work. In the later issues, Batman decides to let an alien force destroy Metropolis and its citizens, Captain Marvel is killed, and Batman kills a genetically manipulated Robin by hurling him into a lava-filled chasm. “I think there was a PTSD effect,” Varley says of 9/11. “I think many people didn’t get over it, that it will continue to affect their lives forever. And I think Frank is one of those people.”