Now he became aware of another problem, as the pressure in his bladder and lower bowels began to grow painful. He felt oddly reluctant to relieve himself inside the body of another creature; it seemed an obscene violation. But, the muscles of his lower stomach told him, he didn't really have a lot of choice.

At last he loosened his trousers and squatted over the narrowest section of the rent in the stomach wall.

He had a bizarre image of his waste being flung through the air in a cloud of brown and yellow. It was highly unlikely, of course, but perhaps one day the stuff would reach the Belt, or the Raft; would one of his acquaintances look up in horror for the source of this foul rain — and think of him?

He laughed out loud; the sound was absorbed by the soft wall around him. He could think of a few nominations for the recipient of such a message. Gover, Roch, Quid… Maybe he should take aim.

His needs satisfied, his curiosity began to reassert itself, and he stared around at the mysterious interior of the whale. It was like being inside some great, glass-wailed ship. From the leading face a wide tube stretched down the axis of the body, contracting as it neared the rear. Entrails of some kind branched off, looking like fat, pale worms that coiled around the principal esophagus. Sacs which could hold four men were suspended around the axial tube, filled with obscure, unmoving forms. Organs were clustered around the main axial canal; and others, vast and anonymous, were fixed to the inner wall of the skin.

Beyond the body's rear Rees could make out the joint to the fluke section, and then the great semicircular flukes themselves, washing through the air with immense assurance and power. The motion of the flukes and the wheeling shadows cast by the starlight through the translucent skin gave the place a superficial impression of motion; but otherwise, apart from a subdued humming, the vast space was still and calm. Rees had read of the great cathedrals of Earth; he remembered staring at the old pictures and wondering what it would be like to stand inside such ancient, huge, still spaces.

Perhaps it would be something like this.

Stepping cautiously over the slippery, yielding surface, he began to make his way toward the whale's leading face.

He neared an organ fixed to the floor. It was an opaque, flattened sphere, twice as tall as he was, and its mass tugged gently at him. He pressed his palm to the tough, lumpy flesh; beneath the surface he could feel hot liquid churn. Perhaps this was the equivalent of a liver or kidney. Crouching, he could see how the organ was attached to the stomach wall by a tight, wrinkled ring of flesh; the ring was clear enough for him to see liquid pulse to and from the dense cartilage.

A Boney spear protruded from the organ, its tip buried an arm's length inside the soft material. Rees took the shaft and carefully slid the spear away from the organ; it emerged damp and sticky. He propped the spear safely within a fold of flesh and walked on.

The floor slanted sharply upwards as he began to climb the slope of the body toward the axis of rotation. At last he was climbing a near-vertical, sheer surface, and he was forced to dig his hands into the cartilage. As he climbed toward the axis the centripetal force lessened, although a Coriolis effect began to make him stagger.

He paused for breath and looked back over the slope he had climbed. The organs fixed to the apparent floor and walls of the chamber were like mysterious engines. The tube of the esophagus stretched away above his head; he noticed now that wrapped around it, close behind the eyes, was a large, spongy mass; filaments like rope connected the sponge to the eyes — optic nerves? Perhaps the convoluted lump was the whale's brain; if so its mass relative to its body must compare favorably with a human's.

Could the whale be intelligent? That seemed absurd… but then he remembered the song of the Boney hunters. The whale must have a reasonably sophisticated sensorium to be able to respond to such a lure.

At last he reached a position just below the join of the esophagus to the face. The whale's triple eyes hung over him like vast lamps, staring calmly ahead; it felt as if he were clinging to the inside of some huge mask.

The face rippled, almost casting him free; he clung tighter to the cartilage. Staring up he saw that the center of the face had split, becoming an open mouth which led directly into the huge throat.

Rees looked out through the face. He made out a blur of motion which slowly resolved itself into a shoal of ghost-white plates which whirled in the air before the whale. These plate creatures were no more than three or four feet wide; some of them, perhaps the young, were far smaller. The creatures had upturned rims — no doubt for aerodynamic reasons — and Rees saw how purplish veins crisscrossed the upper surface of the discs.

The creatures scattered in alarm as the whale approached. The whale's three eyes locked on the plate animals, triangulating with hungry precision. Soon the plates were impacting the great, flat face; the cartilage resounded like a drumskin, making Rees flinch. Doomed plate creatures, still spinning feebly, slid into the whale's maw and disappeared into the opaque esophagus, and soon a series of bulges were passing down the great tube. Rees imagined the still living plates hurling themselves against the walls that had closed around them after a lifetime of free air. After some minutes the first bulge reached a branch to the semitransparent entrails. Battered plates emerged into the comparative stillness of the intestines, some still turning feebly. With vast pulses of clear muscle the bodies were worked along the entrails, dissolving as they moved through vats of digestive gases or fluids.

For perhaps thirty minutes the whale cut a path through the cloud of plate creatures… and then something fast moved at the rim of Rees's peripheral vision. He twisted, peering.

There was a blur, something red and dense that shot across the sky. Now another, and a third; and now a whole flock of them, raining through the air like missiles. The things descended on the shoal of plate creatures in a great, frenzied blur of motion and blood; when they moved on they left behind a cloud of blood and meat scraps—

— and one of the blurs flew at Rees's face. He cried out and flinched backwards, almost losing his grip on the cartilage mask; then he steadied himself and stared back at the creature.

It had come to a halt mere yards before him. It was little more than a flying mouth. A red stump of a body, limbless, perhaps two yards long, was fronted by a circular maw wider than Rees could reach. Eyes like beads clustered round the mouth, which was ringed by long teeth, needle points turned inwards. Now the mouth closed, the flesh stretching over a rudimentary bone structure, until teeth met in a grind of white flashes.

Rees could almost imagine this sky wolf licking its lips as it studied him.

But the eyes of the whale fixed the wolf with a haughty glare, and after a few seconds the wolf shot away to join its companions amid the easier meat of the plate creatures.

Apparently satiated, the whale surged out of the cloud of plates and into clear air. Looking back, Rees could see the sky wolves continue to feast on the hapless plates.

The sky wolves were creatures of children's tales; Rees had never encountered one before. No doubt, like uncounted other species of Nebula flora and fauna, the plates and wolves were careful to avoid the homes of man. Was he the first human to see such a sight? And would the Nebula die before mankind could explore the marvels this strange universe had to offer?

A heavy depression fell upon Rees, and he pressed his face against the inner face of the whale.

The whale forged ever deeper into the heart of the Nebula; the air outside grew darker.