Hogfather - Rules

There were more rooms here, and in each one a cabinet that had been broken open. Shadows moved in the corners. The effect was as though some invisible light source was gently shifting.

'This reminds me a lot of your... um... of your grandfather's place,' said the oh god.

'I know,' said Susan. 'There aren't any rules except the ones he makes up as he goes along. I can't see him being very happy if someone got in and started pulling the library apart-'

She stopped. When she spoke again her voice had a different tone. 'This is a children's place,' she said. 'The rules are what children believe.'

'Well, that's a relief.'

'You think so? Things aren't going to be right. In the Soul Cake Duck's country ducks can lay chocolate eggs, in the same way that Death's country is black and sombre because that's what people believe. He's very conventional about that sort of thing. Skull and bone decorations all over the place. And this place--'

'Pretty flowers and an odd sky.'

'I think it's going to be a lot worse than that. And very odd, too.’

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Hogfather - p282-283