Beyond the Rimfall, the continents of the world were coming into view under swirls of white cloud.

"You know... from up here... you can't see the boundaries between nations," said Carrot, almost wistfully.

"Is that a problem?" said Leonard. "Possibly something could be done."

"Maybe huge, really huge buildings in lines, along the frontiers," said Rincewind. "Or... or very wide roads. You could paint them different colours to save confusion."

"Should aerial travel become widespread," said Leonard, "it would be a useful idea to grow forests in the shape of the name of the country, or of other areas of note. I will bear this in mind."

"I wasn't actually sugges—" Carrot began. And then he stopped, and just sighed.

They went on watching, unable to tear themselves away from the view. Tiny sparkles in the sky showed where more flocks of dragons were sweeping between the world and the moon.

"We never see them back home," said Rincewind.

"I suspect the swamp dragons are their descendants, poor little things," said Leonard. "Adapted for heavy air."

"I wonder what else lives down here that we don't know about?" said Carrot.

"Well, there's always the invisible squid-like creature that sucks all the air out of —" Rincewind began, but sarcasm did not carry very well out here. The universe diluted it. The huge, black, solemn eyes in the sky withered it.

Besides, there was just... too much. Too much of everything. He wasn't used to seeing this much universe all in one go. The blue disc of the world, unrolling slowly as the moon rose, looked outnumbered.

"It's all too big," said Rincewind.

"Yes."

"Ook."

There was nothing to do but wait for full moonrise. Or Discsink.

Carrot carefully lifted a small dragon out of a coffee cup. "The little ones get everywhere," he said. "Just like kittens. But the adults just keep their distance and stare at us."

"Like cats, then," said Rincewind. He lifted up his hat and untangled a small silvery dragon from his hair.

"I wonder if we ought to take a few back?"

"We'll be taking them all back if we're not careful!"

"They look a bit like Errol," said Carrot. "You know, the little dragon that was our Watch mascot? He saved the city by working out how to, er, flame backwards. We all thought he was some new kind of dragon," Carrot added, "but now it looks as though he was a throwback. Is Leonard still out there?"

They looked out at Leonard, who had taken half an hour off to do some painting. A small dragon had perched on his shoulder.

"He says he's never seen light like it," said Rincewind. "He says he must have a picture. He's doing very well, considering."

"Considering what?"

"Considering that two of the tubes he was using contain tomato puree and cream cheese."

"Did you tell him?"

"I didn't like to. He was so enthusiastic."

"We'd better start feeding the dragons," said Carrot, putting his cup down.

"All right. Can you unstick this frying pan from my head, please?"

Half an hour later the flicker of the omniscope screen illuminated Ponder's cabin.

'We've fed the dragons,' said Carrot. 'The plants here are... odd. They seem to be made of a sort of glassy metal. Leonard has a rather impressive theory that they absorb sunlight during the day and then shine at night, thus creating "moonlight". The dragons seem to find it very tasty. Anyway, we shall be leaving shortly. I am just collecting some rocks.'

"I'm sure they will come in useful," said Lord Vetinari.

"Actually, sir, they will be very valuable," whispered Ponder Stibbons.

"Really?" said the Patrician.

"Oh, yes! They may well be completely different from rocks on the Disc!"

"And if they are exactly the same?"

"Oh, that would be even more interesting, sir!"

Lord Vetinari looked at Ponder without speaking. He could deal with most types of mind, but the one apparently operating Ponder Stibbons was of a sort he had yet to find the handles on. It was best to nod and smile and give it the bits of machinery it seemed to think were so important, lest it run amok.

"Well done," he said. "Ah, yes, of course... and the rocks may contain valuable ores, or possibly even diamonds?"

Ponder shrugged. "I wouldn't know about that, sir. But they may tell us more about the history of the moon."

Vetinari's brow wrinkled. "History?" he said. "But no one lives th— I mean, yes, well done. Tell me, do you have all the machinery you need?"

The swamp dragons chewed at the moon leaves. They were metallic, with a glassy surface, and little blue and green sparks sizzled over the dragons" teeth when they bit into them. The voyagers piled them up high in front of the cages.

Unfortunately, the only explorer who would have noticed that the moon dragons ate only the occasional leaf was Leonard, and he had been too busy painting.