Even in the earliest Discworld novels, which were more heavy on parodying fantasy literature, Pratchett was never afraid to break the immersion of his world to tell a joke.

Discworld is self-aware. It knows that you know it's ridiculous. It agrees. Pratchett was never afraid to take the piss out of the world that he created. His footnotes are often a way for the narrator to take you aside and make fun of the new piece of Lore that's just been introduced:

> The idea that Winter could actually be enjoyable would never have occurred to Ramtop people, who had eighteen different words for snow.*
*(All of them, unfortunately, unprintable.)

- Wyrd Sisters, p88

Talking of Wyrd Sisters, there's one scene in my mind that sticks out as pure Mum.

Our three protagonists - Esme 'Granny' Weatherwax, Gytha 'Nanny' Ogg, and Magrat '' Garlick, all witches - go to see a play. It's touted as a professional production, but Pratchett frames everything as though it were a Punch and Judy show - just sacking curtains and planks of wood laid over barrels.

And yet:

> [The theatre] had also managed to become The Castle, Another Part of the Castle, The Same Part A Little Later, The Battlefield, and now it was A Road Outside the City.

Granny Weatherwax watches a king being murdered in the play, and calls bullshit:

> "He's killed him," she hissed, "Why isn't anyone doing anything about it? […] right up there in front of everyone!"

Magrat grounds her fellow witch to limited success. The next scene in the play is a long soliloquy by the murderer, and how he's filled with so much regret:

> Granny was not to be distracted. "What'd he go and kill him for, then?"

Nanny Ogg jumps in as the mediator:

> "I reckon," she said slowly, "I reckon it's all just pretendin'. Look, he's still breathing."
[…]
The corpse tried to shuffle its feet behind a cardboard bush.

Things don't just stop there, though - no, no, no. It's a well-known fact on #Discworld that Witches can go wherever they like. The three of them head backstage…

> "You!" [Granny Weatherwax] shouted. "You're dead!"

That, he was. And there, after a fake bush meets a Lancre steel-capped boot and bursts into splinters, she exposes the lie to the world at large:

> "See?" […] "Nothing's real! It's all just paint, and sticks and paper at the back."

At first, you might think this whole affair ridicules the sorts of hackneyed scenes that are ONLY (and I repeat, ONLY) possible in entertainment. One example soaps have been leaning on since we could put phones in our pocket:

> If your character is going to be killed off, you WILL show the viewer their forgetting to charge their phone, and it WILL run out of juice when they need it most.

- https://brologue.net/2023/11/05/fantasy-for-mums/

But when you think about it, Granny Weatherwax, in her own abrasive way, critically (and literally) deconstructs the secondary world that the production asks the audience to believe.

How did Mum prove to Dad that dragons aren't real? She googled for dragons and found their Wikipedia page:

https://en.wikipedia.org/wiki/Dragon

For the same effect, she could've looked up some behind-the-scenes videos of the actors flailing in front of a greenscreen. None of it's real.

So, what's all this simulacra and simulation business, then? When we see a White Walker or a dragon on-screen, what relation do they have to our reality? That is: what does Mum mean when she says a dragon isn't 'real?'

I'll start with something that reflects the real world, one-to-one: a photograph. If you're looking for a place to eat while abroad, you're most likely going to look at the unedited photos of food by previous patrons to know what you're getting into. If you can trust that the photo hasn't been edited at all, then it's as true a reflection of reality as we might get.