Brutha awoke with the smell of the sea in his nostrils. At least it was what people think of as the smell of the sea, which is the stink of antique fish and rotten seaweed.
He was in some sort of shed. Such light as managed to come through its one unglazed window was red, and flickered. One end of the shed was open to the water. The ruddy light showed a few figures clustered around something there.
Brutha gently probed the contents of his memory. Everything seemed to be there, the Library scrolls neatly arranged. The words were as meaningless to him as any other written word, but the pictures were interesting. More interesting than most things in his memory, anyway.
He sat up, carefully.
"You're awake, then," said the voice of Om, in his head. "Feel a bit full, do we? Feel a bit like a stack of shelves? Feel like we've got big notices saying "SILENCIOS!" all over the place inside our head? What did you go and do that for?"
"I … don't know. It seemed like … the next thing to do. Where are you?"
"Your soldier friend has got me in his pack. Thanks for looking after me so carefully, by the way."
Brutha managed to get to his feet. The world revolved round him for a moment, adding a third astronomical theory to the two currently occupying the minds of local thinkers.
He peered out of the window. The red light was coming from fires all over Ephebe, but there was one huge glow over the Library.
"Guerrilla activity," said Om. "Even the slaves are fighting. Can't understand why. You think they'd jump at the chance to be revenged on their masters, eh?"
"I suppose a slave in Ephebe has the chance to be free," said Brutha.
There was a hiss from the other end of the shed, and a metallic, whirring noise. Brutha heard Urn say, "There! I told you. Just a block in the tubes. Lets get some more fuel in."
Brutha tottered towards the group.
They were clustered round a boat. As boats went, it was of normal shape-a pointed end in front, a flat end at the back. But there was no mast. What there was, was a large, coppercolored ball, hanging in a wooden framework toward the back of the boat.
There was an iron basket underneath it, in which someone had already got a good fire going.
And the ball was spinning in its frame, in a cloud of steam.
"I've seen that," he said. "In De Chelonian Mobile. There was a drawing."
"Oh, it's the walking Library," said Didactylos. "Yes. You're right. Illustrating the principle of reaction. I never asked Urn to build a big one. This is what comes of thinking with your hands."
"I took it round the lighthouse one night last week," said Urn. "No problems at all."
"Ankh-Morpork is a lot further than that," said Simony.
"Yes, it is five times further than the distance between Ephebe and Omnia," said Brutha solemnly. "There was a scroll of maps," he added.
Steam rose in scalding clouds from the whirring ball. Now he was closer, Brutha could see that half a dozen very short oars had been joined together in a star-shaped pattern behind the copper globe, and hung over the rear of the boat. Wooden cogwheels and a couple of endless belts fiIled the intervening space. As the globe spun, the paddles thrashed at the air.
"How does it work?" he said.
"Very simple," said Urn. "The fire makes-
"We haven't got time for this," said Simony.
"-makes the water hot and so it gets angry," said the apprentice philosopher. "So it rushes out of the globe through these four little nozzles to get away from the fire. The plumes of steam push the globe around, and the cogwheels and Legibus's screw mechanism transfer the motion to the paddles which turn, pushing the boat through the water."
"Very philosophical," said Didactylos.
Brutha felt that he ought to stand up for Omnian progress.
"The great doors of the Citadel weigh tons but are opened solely by the power of faith," he said. "One push and they swing open."
"I should very much like to see that," said Urn.
Brutha felt a faint sinful twinge of pride that Omnia …
