The Angelina Jolie Paradox applies.
"The what now?"
Sagan cleared his throat. "You know when you're watching a movie starring Angelina Jolie? And the character she's playing looks just like Angelina Jolie, right?"
"Um, yes. Because that's who she is."
"No, she's a regular person in that world, not a movie star. But the other characters never mention that she looks exactly like Angelina Jolie. No one ever comes up to her on the street and says, 'Can I have your autograph?'"
"Because that would mess up the movie," Carla said.
"Exactly. So when you cast Angelina Jolie in a film, you're creating an alternate universe in which actress Angelina Jolie does not exist. Because otherwise people would be noticing the resemblance all the time. This is what I call the Angelina Jolie Paradox."
"You know, Sagan," Carla said. "You could have named that paradox after any movie star."
"True. But as the paradox's discoverer, I have chosen Angelina Jolie, as is my right."
Copyright 2014 by Scott Westerfeld