It's a beautiful fall day, crisp and clear, with just enough breeze off the river that she needs a lap robe. He's pushing her around the grounds in her wheelchair. The gravel on the path crunches underfoot. He's telling her a story, full of gangsters and gunrunners. She doesn't really follow it. Too complicated, too many foreign names, too many people she doesn't know.The point, of course, is that he's telling her the story you've just read. There's a term for his, and I believe it's called metafiction– correct me if I'm wrong– meaning a narrative that's self-referential, where you play with convention, and the story comments on its own structure or dynamic. This, in turn, got me thinking about breaking the Fourth Wall.
The equivalent these days would be first-person narration, where whoever's telling the story let's you know what's going on in their head, or admits they don't in fact know what's going on. MAGNUM P.I. often used voice-over, and one common phrase Magnum was fond of, as he went off on some errand you knew could only lead to trouble, was "I know what you're thinking, but–" This is actually a variation on a Victorian literary trope, had-he-but-known. Nor were the Victorians at all
We follow certain conventions, and I think rightly, because we assume a bargain between the writer and the reader, and you basically have to play fair. It doesn't mean you can't have an unreliable narator, or be deceptive, or simply mischievous, but the reader understands you're in collusion with each other. He or she surrenders to the illusion in hopes of being entertained, or invigorated, puzzled, or shocked, or surprised, even transported. When do you break the rules? In effect, only when you have the reader's permission. If you step out from behind the curtain, you have to do it in good faith. "I know what you're thinking, but---" In other words, the reader is your accomplice.
This is part of the bargain, that you enter into a world of masks, and the writer can let the mask slip, if you have what amounts to informed consent. You're dealing from a marked deck. The reader accepts this, if the narrative is convincing, and the sleight of hand reinforces it. What your reader won't forgive is the loss of trust. You've invited them in, after all, and they've made the choice to be included, to inhabit the fiction, the understanding that you'll give good weight. You promise, across the footlights, to make mad the guilty, and appall the free, unpack your heart with words. They'll take you up on it.