A heavy cloud, fat with rain, drifted over the Belt, reducing visibility to a few yards; the air it brought with it seemed exceptionally sour and thin.

Rees prowled around the cables that girdled his world, muscles working restlessly. He completed two full circuits, passing huts and cabins familiar since his childhood, hurrying past well-known faces. The damp cloud, the thin air, the confinement of the Belt seemed to come together somewhere inside his chest.

Questions chased around his skull. Why were human materials and building methods so inadequate to resist the forces of the world? Why were human bodies so feeble in the face of those forces?

His father used to say the mine was killing them all. Humans weren’t meant to work down there, crawling around in wheelchairs at five gee.

Now his parents were dead.

Rees was still a boy. But he faced a prospect of nothing more than to labor in the kernel mines, to have his health broken by the monstrous gravity, to die young.

Shards of speculation glittered in the mud of his overtired thinking. His parents had had no better understanding of their circumstances than he had; there had been nothing but legends they could tell him before their sour deaths of overwork: children’s tales, of a Ship, a Crew, of something called Bolder’s Ring…

But his parents had had — acceptance. They, and the rest of the Belt dwellers, accepted their lot.

Only Rees seemed plagued by questions, unanswered doubts. Why couldn’t he be like everyone else? Why couldn’t he just accept and be accepted?

His arms, punctured by hot metal, ached. A vague anger suffused him. Well, why should he accept this? Why should he die, broken-down by the five gee of the Star’s kernel, without learning more, the truth of the world?

He had to find out more. And in all his universe there was only one place he could go to find it.

The Raft. Somehow he had to get to the Raft.

The shadow of the great tree slid over the Belt. A rope had uncoiled from the tree trunk and lay across the fifty yards to the Belt, brushing against the orbiting cabins. A man came shimmering confidently down the rope; he was scarred, old and muscular, almost a piece of the tree himself. The man dropped without hesitation across empty air to a cabin and began to make his way around the Belt.

A sudden determination crystallized in Rees. He hurried around the Belt to his cabin.

It took minutes to gather up some food, wrapping dried meat in bundles of cloth, filling cloth globes with water.

Then he climbed to the outer wall of his cabin.

Rees clung to his cabin by one hand. The rotation of the Belt carried the cabin steadily towards the tree’s dangling rope.

As the rope approached, a thin sweat covered his brow. Was he somehow throwing his life away in this impulsive gesture? Would he, in the end, have the courage to take the decisive step?

Staring at the magnificent tree he probed at his emotions. There was no fear. There was only elation; the future was an empty sky, within which his hopes would surely find room.

When the rope was a yard from him he grabbed at it and swarmed without hesitation off the Belt.

A file of miners clambered up to the tree, iron plates strapped to their backs. Under the tree-pilot’s supervision the plates were lashed securely to the tree rim, widely spaced. The miners descended to the Belt laden with casks of food and fresh water, delivered from the Raft in payment for the kernel metal.

Rees, watching from the foliage, stayed curled closely around a two-feet-wide branch — taking care not to cut open his palms on its knife-sharp leading edge — and he kept a layer of foliage around his body. He had no way of telling the time, but the loading of the tree must have taken several shifts.

He was wide-eyed and sleepless. He knew that his absence from work would go unremarked for at least a couple of shifts — and, he thought with a distant sadness, it might be longer before anyone cared enough to come looking for him.

Well, the world of the Belt was behind him now. Whatever dangers the future held for him, at least they would be new dangers.

In fact he only had two problems. Hunger and thirst…

Disaster had struck soon after he had found himself this hiding place among the leaves. One of the Belt workmen had stumbled across his tiny cache of supplies; thinking it belonged to the despised Raft crewmen the miner had shared the morsels among his companions. Rees had been lucky to avoid detection himself, he realized… but now he had no supplies, and the clamor of his throat and belly had come to fill his head.

When the final miner had slithered down to the Belt Pallis curled up the rope and hung it around a hook fixed to the trunk. He hated these visits to the Belt, the way he was forced to negotiate so hard with these ragged, half-starved miners. He shook his head and turned his thoughts with some relief to the flight home.

“Right, Gover, let’s see you move! I want the bowls switched to the underside of the tree, filled and lit before I’ve finished coiling this rope. Or would you rather wait for the next tree?”

Gover got to work, comparatively briskly; and soon a blanket of smoke was spreading beneath the tree, shielding the Belt and its star from view.

Pallis stood close to the trunk, his feet and hands sensitive to the excited surge of sap. It was almost as if he could sense the huge vegetable thoughts of the tree as it reacted to the darkness spreading below it. The trunk audibly hummed; the branches bit into the air; the foliage shook and swished and skitters tumbled, confused at the abrupt change of airspeed; and then, with an exhilarating surge, the great spinning platform lifted from the star. The Belt and its human misery dwindled to a toylike mote, falling slowly into the Nebula, and Pallis, hands and feet pressed against the flying wood, was where he was most happy.

His contentment lasted for about a shift and a half.

He prowled the wooden platform, moodily watching the stars slide through the silent air. The flight just wasn’t smooth. Oh, it wasn’t enough to disturb Gover’s extensive slumbers, but to Pallis’s practiced senses it was like riding a skitter in a gale. He pressed his ear to the ten-feet-high wall of the trunk; he could feel the bole whirring in its vacuum chamber as it tried to even out the tree’s rotation.

This felt like a loading imbalance… but that was impossible. He’d supervised the stowage of the cargo himself to ensure an even distribution of mass around the rim. For him not to have spotted such a gross imbalance would have been like — well, like forgetting to breathe.

Then what?

With a growl of impatience he pushed away from the trunk and stalked to the rim. He began to work around the lashed loads, methodically rechecking each plate and cask and allowing a picture of the tree’s loading to build up in his mind—

He slowed to a halt. One of the food casks had been broken into; its plastic casing was cracked in two places and half the contents were gone. Hurriedly he checked a nearby water cask. It too was broken open and empty.

He felt hot breath course through his nostrils. “Apprentice! Come here!”

The boy came slowly, his thin face twisted with apprehension.

Pallis stood immobile until Gover got within arm’s reach; then he lashed out with his right hand and grabbed the apprentice’s shoulder. Pallis pointed at the violated casks. “What do you call this?”

Gover stared at the casks with what looked like real shock. “Well, I didn’t do it, pilot. I wouldn’t be so stupid — ah!”

Pallis worked his thumb deeper into the boy’s joint, searching for the nerve. “Did I keep this food from the miners in order to allow you to feast your useless face? Why, you little bone sucker, I’ve a mind to throw you over now…”