Filmmaker Christopher Nolan, who has helmed the "Dark Knight" trilogy, says each of the "Batman" films helmed by him explore a different genre."Batman is a superhero, but based on ideas of guilt, fear, these strong impulses that the character has. Bruce Wayne doesn39t have any super powers other than extraordinary wealth," Nolan told variety.com.Nolan says Batman is just someone who does a lot of push-ups. "In that sense, he39s very relatable and human. I think that39s why I gravitated towards it."To me, each film is a different genre. They tend to be defined by the villain... We hadn39t planned on doing a sequel. So shifting genres and the nature of the antagonist felt the way to take the audience on a journey and tell them something different about Bruce Wayne," he added.