'It's a sliding puzzle,' said Adora Belle, 'but with lots more directions to slide.'
'That is a very graphic analogy which aids understanding wonderfully while being, strictly speaking, wrong in every possible way,' said Ponder.
Adora Belle's eyes narrowed. She had not had a cigarette for ten minutes.
The long drawer extruded another drawer at right angles. All along the sides of it were, yes, yet more drawers. One of these extended slowly.
Moist took a risk, and tapped on what appeared to be perfectly ordinary wood. It made a perfectly ordinary noise. 'Should I worry that I just saw a drawer slide through another drawer?' he said.
'No,' said Ponder. 'The Cabinet is trying to make four-dimensional sense of something that is happening in eleven or, possibly, ten dimensions.'
'Trying? Do you mean it's alive?'
'Aha! The right type of question!'
'I bet you don't know the answer, though.'
'You are correct. But you must admit it's an interesting question not to know the answer to. And, yes, here we have the Foot. Hold and collapse, please, Hex.'
The drawers collapsed back into themselves in a series of crashes, much shorter and less dramatic than before, leaving the Cabinet looking demure and antique and slightly bow-legged. It had little claws as feet, a cabinet-makers' affectation that always annoyed Moist in a low-grade way. Did they think the things moved around in the night? Or maybe the Cabinet really did.
And the Cabinet's doors were open. Nestling inside, and only just fitting, was a golem's foot, or at least most of one.
Once, golems were beautiful. Once, the very best sculptors probably made them to rival the most beautiful of statues, but long since then the fumble-fingered many who could barely make a snake out of clay found that bashing the stuff into the shape of a big hulking gingerbread man worked just as well.
This foot was one of the early kind. It was made of a clay-like white china, with patterns of tiny raised markings in yellow, black and red. A little brass plate in front of it was engraved in Uberwaldian: 'Foot of Umnian Golem, Middle Period.'
'Well, whoever made the Cabinet comes from - '
'Anyone looking at the label sees it in their native tongue,' said Ponder wearily. 'The markings apparently indicate that it did indeed come from the city of Um, according to the late Professor Head.'
'Um?' said Moist. 'Um what? They weren't sure what to call the place?'
'Just Um,' said Ponder. 'Very ancient. About sixty thousand years, I believe. Back in the Clay Age.'
'The first golem-makers,' said Adora Belle. She unslung the bag and started to rummage in the straw.
Moist tapped the foot. It seemed eggshell thin.
'It's some sort of ceramic,' said Ponder. 'No one knows how they made it. The Umnians even baked boats out of the stuff.'
'Did they work?'
'Up to a point,' said Ponder. 'Anyway, the city was totally destroyed in the first war with the ice giants. There's nothing there now. We think that the foot was put in the Cabinet a long time ago.'
'Or will be dug up some time in the future, perhaps?' said Moist.
'That could very well be the case,' said Ponder gravely.
'In which case, won't that be a bit of a problem? I mean, can it be in the ground and in the Cabinet at the same time?'
'That, Mr Lipwig, is - '
'The wrong type of question?'
'Yes. The box exists in ten or possibly eleven dimensions. Practically anything may be possible.'
'Why only eleven dimensions?'