“It’s like a play, Dean,” said Ponder Stibbons. “The characters just see the act they’re in. They don’t see the scenery being shifted because that’s not part of the play.”
+++ Despite being wrong in every important respect, that is a very good analogy +++ Hex wrote.

lies to wizards | Terry Pratchett, Ian Stewart, and Jack Cohen, The Science of Discworld III: Darwin’s Watch