But the straight lines dividing light from dark on the arch of the Ringworld were all terminators.
From spinward, the terminator line swept toward the flycycle fleet From ground to sky it ran, from infinity-port to infinity-starboard. It came on like destiny made visible, a moving wall too big to go around.
It arrived. The corona brightened overhead, then blazed as the withdrawing shadow square exposed a rim of solar disc. Louis contemplated the night to his left, the day on his right, the terminator shadow receding across an endless plain. A strange dawn, staged for Lotus Wu the tourist.
Far to starboard, beyond where the land turned to haze, the sharp outlines of a mountain peak materialized in the new daylight.
"Fist-of-God," said Louis Wu, tasting the rolling sound of it in his mouth. What a name for a mountain! But especially, what a name for the greatest mountain in the world!
Louis Wit the man ached. If his body didn't begin adjusting soon, his jouints would freeze him in sitting position and he'd never move again. Furthermore, his food bricks were beginning to taste like — bricks. Moreover, his nose was still partly numb. And there still wasn't any coffee spigot.
But Louis Wu the tourist was being royally entertained. Take the puppeteer flight reflex. Nobody had ever suspected that it might also be a fighting reflex. Nobody but Louis Wu.
Take the starseed lure. What a poetic thing to leave lying about! A simple device, invented thousands of years ago, Nessus had said. And no puppeteer had ever thought to mention it, until yesterday.
But puppeteers wen so completely unpoetic.
Did the puppeteers know why Outsider ships followed starseeds? Did they gloat in the knowledge? Or had they learned that secret, then discarded it as irrelevant to the business of living forever?
Nessus was out of the intercom circuit. Asleep, probably. Louis signaled him, so that the puppeteer would see the light on his panel and call him when he woke.
Did he know?
The starseeds: mindless beings who swarmed in the galactic core. Their metabolism was the solar phoenix, their food was the thinly-spread hydrogen of interstellar space. Their motive power was a photon sail, enormous and highly reflective, controlled like a skydiver's parachute. A starseed's egg-laying flight commonly took it from the galactic axis out to the edge of intergalactic space and then back, without the egg. The hatched starseed chick must find its own way home, riding the photon wind, to the warm, hydrogen-rich core.
Where the starseeds went, then went the Outsiders.
Why did Outsiders follow starseeds? Whimsical question, though poetic.
Maybe not so whimsical. Back around the middle of the first Man-Kzin war a starseed had zigged instead of zagging. The Outsider ship following it had cruised past Procyon. Had paused long enough to sell We Made It a hyperdrive shunt.
The ship could as easily have wandered into kzinti instead of human space.
Amd hadn't the Puppeteers been studying the kzinti about that time?
"Tanjit! That's what I get for letting my mind wander. Discipline, that's what I need."
But hadn't they? Sure they had. Nessus had said so. The puppeteers had been researching the kzinti, investigating whether they could be exterminated safely.
Then the Man-Kzin war had solved their problem. An Outsider ship had wandered into human space to sell We Made It a hyperdrive shunt, while the kzinti armada was sweeping inward from the opposite border. Once human warships had the hyperdrive shunt, the kzinti had ceased to be a threat to man and puppeteer alike.
"They wouldn't dare," Louis told himself. He was appalled.
"If Speaker ever -" But that possibility was even worse.
"An experiment in selective breeding," said Louis. "Selective there-ain't-no-justice breeding. But they used us. They used us!"
"Yes," said Speaker-To-Animals.
For an instant Louis was sure he had imagined it. Then he saw Speaker's transparent, miniature image at the top of his dashboard. He had left the intercom open.
"Tanj for torment! You were listening!"
"Not by choice, Louis. I neglected to switch off my intercom."
"Oh." Too late, Louis remembered Speaker grinning at him, supposedly out of hearing range, after Nessus had finished describing a starseed lure. Remembered that kzinti ears were made to serve a hunting carnivore. Remembered that the kzinti smile reflex is intended to free the teeth for battle.
"You mentioned selective breeding," said Speaker.
"I was just -" Louis floundered.
"The puppeteers pitted our species against each other in order to restrict kzinti expansion. They had a starseed lure, Louis. They used it to guide an Outsider ship into your space, to ensure a human victory. An experiment in selective breeding, you called it."
"Listen, times a very chancy chain of assumptions. If you'll just calm down -"
"But we both followed that chain."
"Um."
"I was in doubt as to whether to broach the subject to Nessus, or whether to wait until we had accomplished our major objective, which is to leave the Ringworld. Now that you know the situation, I have no choice."
"But -" Louis closed his mouth. The siren would have drowned him out anyway. Speaker had signaled emergency.
The siren was a maniac mechanical scream, a subsonic and supersonic and jarringly painful sound. Nessus appeared above the dash, crying, "Yes? Yes?"
Speaker roared his answer. "You have meddled in a war in the enemy's favor! Your action is tantamount to a declaration of war against the Patriarchy!"
Teela had cut in in time to hear the last part. Louis caught her eye, shook his head. Dont mix in.
The puppeteer's heads reared like snakes to show his astonishment. His voice was without inflection, as usual. "What are you talking about?"
"The First War with Men. Starseed lures. The Outsider hyperdrive shunt."
A triangular head dipped out of sight. Louis watched a silver flycycle drop out of formation, and knew it was Nessus.
He was not terribly worried. The other two flycycles looked like silver midges, so far away were they, and so far apart. If the fight had taken place on the ground, someone could have been seriously hurt. Up here, what could happen? The puppeteer's flycycle had to be faster than Speaker's. Nessus would have seen to that. He would have made certain he could outrun a kzin when necessary.
Except that the puppeteer wasn't fleeing. He was looping around at Speaker's 'cycle.
"I do not wish to kill you," said Speaker-To-Animals. "If you intend to attack from the air, you should remember that the range of your tasp may be less than the range of the Slaver digging beam. SNARL!"
The kzinti killing yell was blood-freezing. Louis's muscles locked in position, as with tetanus. He was only dimly aware of the silver dot that looped away from Speaker's cycle.
But he did notice Teela's look of open-mouthed admiration.
"I do not intend to kill you," Speaker-To-Animal add more calmly. "But I will have answers, Nessus. We know that your race can guide starseeds."
"Yes," said Nessus. His 'cycle was receding to port at improbable speed. The feral calm of the aliens was an illusion. It existed only because Louis Wu could not read expression in an alien face, and because the aliens could not put human expression into the Interworld language.
Nessus was fleeing for his life, but the kzin had not left his place in formation. He said, "I will have answers, Nessus."
"You have guessed correctly," said the puppeteer. "Our investigation of safe methods to exterminate the vicious, carnivorous kzinti showed that your species has a high potential, that you could conceivably be of use to us. We took steps to evolve you to the point where you could deal peaceably with races alien to you. Our methods were indirect, and very safe."