Then the pain started.
His stomach, empty for so long, seemed to be slowly imploding, filling the center of his body with a dull, dragging ache. His joints protested when he began to stir — stiff joints were a wholly unexpected side-effect of hunger, reducing his movements on bad days to those of an old man — and there was a sharp sheet of pain stretched around the inside of his skull, as if his brain were pulling away from the bone.
He jammed his eyes closed and wrapped his arms around himself, feeling his own bony elbows digging into his ribs. How strange it was that he had never slept more deeply in his life than in these impossibly difficult times. While waking life had become steadily more unbearable, sleep was ever more comfortable, seductive, a different realm in which his physical pain and mental distress dissolved.
If only I could stay there, he thought. How easy it would be never to wake up again…
But already the pain had dug too far into his awareness for that option to be available today.
With a sigh he opened his eyes and probed at the cups with one finger, working at rims sharp with crusty sleep deposits. Then he clambered slowly out of his loose sling of ropes. The rest of the Human Beings — the other fourteen — were scattered across the lower rim of the forest, bound by similar loops of rope. Dangling there half-asleep they looked like the pupae of insects, deformed spin-spiders perhaps.
Mur dropped out of the forest, avoiding the eyes of those others who were awake.
He stretched, his muscles still aching from yesterday’s Waving. He pulled a handful of leaf-matter from the tree, and then flexed his legs and Waved stiffly down into the Mantle. Perhaps twenty mansheights below the fringe of the forest ceiling he lifted his tunic and raised his legs to his chest. His hips and knees protested, but he grabbed his lower legs and pulled his thighs close to his stomach. At first his bowels failed to respond to this prompting — like the rest of his system his digestive and elimination processes seemed to be failing, slowly — but he persisted, keeping his arms wrapped around his legs.
At last his lower bowel convulsed, and — with a stab of pain which lanced through the core of his body — a hard packet of waste was expelled into the Air. He glanced down. The waste, floating down into the Mantle, was compact, too dark.
He cleaned himself with his handful of leaves.
Dia, his wife, came drifting down from the impromptu camp in the forest. As she descended, he saw how she was blinking away the remnants of sleep and compressing her eyecups against the brightness of the Air; but she was already — just moments after waking — squinting along the vortex lines into the South, toward the distant Pole, trying to assess how far they had come, how much further was left of this huge odyssey.
When she reached Mur she looked into his face, kissed him on the lips, and wrapped her arms around his chest. He folded his arms around her and rubbed her back. Through her shabby poncho he could feel the bones of her spine. They had nothing to say to each other, so they clung to each other, hanging in the silent Air, with the Quantum Sea spread below them.
Since Dura and the City woman had left in their Air-car — taking away the children, including their own Jai — the fifteen abandoned Human Beings had trekked across the Mantle toward the Pole. The slow pulsations of the vortex lines marked out the endless days of the journey. With no stores of food, the Human Beings were forced to follow the fringe of the Crust-forest; the leaves of the trees were scarcely nutritious, but they did serve to fool the body into forgetting its hunger for a while. Every few days their food ran out and they were forced to interrupt the march. There was some game to be had but the forest was unfamiliar, and the animals, still scared and scattered after the most recent Glitch, were wary and difficult to trap.
Without their own herd, the Human Beings were slowly starving to death. And on this hopeless trek, with its endless days of slow, painful Waving, the Human Beings were probably burning off their energy faster than they could replace it. Mur couldn’t forget the richness of the “bread” Dura had brought to them, when she had come Waving out of the sky so unexpectedly with her startling stories of Cities in the Air.
Their progress around the Mantle’s curve was imperceptible, a crushingly discouraging crawl. Every time he woke to another changeless Mantlescape Mur felt discouraged. And, even when the Pole was neared, the Human Beings would still have to cross the hinterland, the cultivated belt around the Pole. How would the inhabitants of those regions — themselves suffering after the Glitches — welcome this band of starving refugees as they came drifting beneath their ceiling-farms?
The logical thing for the Human Beings to do would be to give up this trek. Their best chance of survival would be to stay here, or even retreat a little further into the upflux, and try to establish a new home on the edge of the Crust-forest. Stop wasting their energies on this trek. They could build a new Net, establish a new herd of Air-pigs. They could even, he’d thought dizzily as he Waved across the silent Air, experiment with maintaining flocks of rays. The flesh of the ray was tough and not as palatable as Air-pig, but it softened when broiled using nuclear-burning heat; and the eggs were fine to eat and easy to store.
…But, of course, that wasn’t possible; for their children had been taken from them, by well-meaning Dura, and transported to the South Pole. When he stared into the dull crimson glow of the Pole, in the far downflux, Mur felt as if a chain as long as a vortex line connected him directly to his child, a chain which dragged inexorably at his heart. Dura’s action had surely been in the best interests of the children. But it left Mur knowing that his only chance of meeting his son again was to stay alive and to complete this trek, all the way to the City at the Pole.
He squeezed Dia once, and then they broke and prepared to return to the Crust-forest, to face the others and begin the day’s work.
“Dia! Mur!” The voice, drifting down from the Crust-forest, radiated excitement.
Dia and Mur slowed their ascent, confused, and looked up. Philas was dropping toward them, her skinny legs pumping at the Air. When she reached the couple, she grabbed at their arms to stop herself.
Dia held Philas’s shoulders. “What is it? What’s wrong?”
Philas, panting, the bones of her face prominent under her tied-back hair, shook her head. “Nothing’s wrong. But… look. Look down there.” She pointed, down past their feet into the Mantle.
The three of them separated and tipped forward in the Air. Mur peered down, trying to follow the direction of Philas’s gesture. He saw the orderly array of vortex lines, the dull purple bruise of the Quantum Sea beyond the crystalline Air. There seemed nothing unusual, except…
There. A small, dark knot in the Air, a hint of motion.
He turned to Dia. “Your eyes are sharper than mine. What is it?”
“People,” she said, squinting down. “A group of them. Twenty or thirty, maybe. It looks like an encampment. But there’s something at the center…”
“What?”
Philas thrust her face forward at Dia. “Do you see it?”
“I think so,” Dia said slowly. Her eyes narrowed. “But it might not mean anything. Philas…”
Mur was baffled. “What is it? What do you see?”
Uncertainty and fear creased Dia’s small, pretty face. “It’s a tetrahedron,” she said.
The fifteen Human Beings gathered on the lower edge of the forest and debated what to do. Dia, fearful, uncertain, thought they shouldn’t waste time on this chance encounter; she wanted simply to continue with the slog to the Pole. Mur sympathized. The Human Beings were already divided, listless, growing steadily more apathetic. It was becoming ever harder to maintain the momentum of this trek across the Mantle; and once that momentum was gone, it might be impossible to regain.