Science fiction writers put characters into a world with arbitrary rules and work out what happens.
What if nothing exists and we're all in somebody's dream?
Middle-earth is a universe I know very well.
I think that a good movie creates its own world, and that world needn't refer to anything that's real. If it's consistent, if it's entertaining, if it's interesting, it justifies its being there.
We like to imagine that Shaun is in George Romero's universe, that it's happening at the same time as the Pittsburgh outbreak.
With any sci-fi fantasy storytelling, you must have rules be very clear, otherwise you lose people, like 'OK, they can fly; now they can't fly.'
I mean, I'm on a comic book. I'm in a video game. This is not real life.
The supernatural world, the sci-fi world - they give you scenarios that can truly be life or death.