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The similarities between Batman trilogy was different to other superhero films.
"The thing about Bruce Wayne is that his superpower is money and rage," he said. "And there's something transformative about a normal person, not a guy who was born with some magical gift that he just discovers, but a person who decides to become something extraordinary.
"I think I always related to that. It's always been the key difference between a character like Batman and all the other characters in the DC pantheon.
"There are some great characters there, but this is the one I always kind of connected to the most.
"You had all kinds of science fiction and some fantasy throughout the Batman books through 70 years, but for the most part, we took the idea that this was a real guy in the real world and ran in that direction."
The movie has remained at the top of the US box office for the second weekend running - taking $64m in ticket sales while its nearest rival was Ice Age 4: Continental Drift with $13m.