Oppenheimer was filmed around Cillian Murphy's haircut

Christopher Nolan thinks J. Robert Oppenheimer was the most important person who ever lived. Asked by The New York Times about this statement, he replied, "Do I really believe him? Absolutely. Because if my worst fears are true, he will be the man who destroyed the world. Who is more important than that?" Which is a pretty dark way to start an interview, even if it's a disturbing and compelling statement. Luckily, the director didn't remain so anxious throughout his interview with the outlet.

At one point, Nolan broached the subject of Cillian Murphy — specifically her haircut, which turned out to be more concerning than anyone would have thought. Nolan is known for his insistence on using practical effects as much as possible and for trying to capture as many of his films "in camera" as possible. That's why we saw a literal overturned semi-truck in "The Dark Knight" and why we saw a real 747 plane crash in "Tenet." But this meticulousness in practical effects apparently extends to the hairstyles of the actors.

As Nolan went on to tell the NYT, "I insisted on scheduling [the filming] around Cillian's haircut. Because I'm very allergic to wigs in movies. I really wanted the movie to have no obvious gimmicks in terms of how the characters present themselves." Going along with "obvious artifice" is a good way to describe Nolan's filmography in general, and it's interesting to see how far this insistence on keeping things as real as possible goes.