Genar-Hofoen glanced round at the mistretl. "Well," he said, "let's get going." The little mistretl blinked quickly, still staring up the street. Another bellow echoed off the surrounded buildings. Genar-Hofoen looked back again.
The charging pondrosaur reached up with one fore-limb and ripped its eye-cups off to reveal huge, faceted blue eyes like chunks of ancient ice. With its other limb it gripped the mahout by one shoulder and wrenched him off its neck; he wriggled and flailed but it brushed him to one side and onto the pavement; he landed running, fell and rolled. The pondrosaur itself thundered on down the street; people threw themselves out of its way. Somebody in a bubblesphere didn't move fast enough; the giant transparent ball was kicked to the side, smashing into a hot food-stall; flames leapt from the wreckage.
"Shit," Genar-Hofoen said as the giant bore down upon them. He turned to the mistretl driver again. He could see the face of the ysner, turned back to look up the street behind too, its big face expressing only mild surprise. "Move!" he shouted.
The mistretl nodded. «Goo» i'ea," it chirped. It reached behind to slip a knot on the rear of the ysner and jabbed its bootheels into the animal's lower neck. The startled ysner took off, leaving the trap behind; the vehicle tipped forward as the ysner-mistretl pair disappeared down the rapidly clearing street. Genar-Hofoen and Flin were thrown forward in a tangle of harnesses. He heard her shout, "Fuck!" then go oof as they hit the street.
Something hit him hard on the head. He blacked out for a moment then came to looking up at a huge face, a monstrous face, gazing down at him with huge prismed blue eyes. Then he saw the woman's face. The face of Dajeil Gelian. She had blood on her top lip. She looked groggily at him and then turned to gaze up at the huge animal face looking down at them. There was a sort of buzzing sensation from somewhere; Genar-Hofoen felt his legs go numb. The woman collapsed over his legs. He felt sick. Lines of red dots crossing the sky floated behind his eyelids when they closed. When he forced his eyes open again, she was there again. Somebody looking like Dajeil Gelian who wasn't her. Except it wasn't Flin either. She was dressed differently, she was taller and her expression was… not the same. And anyway, Flin was still draped unconscious over his legs.
He really didn't understand what was going on. He shook his head. This hurt.
The girl who wasn't Dajeil or Flin stooped quickly, looked into his eyes, whirled the cloak off her shoulders and onto the street beside him in one movement, then rolled him over onto it, heaving Flin's immobile body out of the way as she did so. He tried waving his arms around but it didn't do much good.
The cloak went rigid underneath him and floated into the air, wrapping round him. He cried out and tried to fight against its enclosing black folds, but the buzzing came again and his vision faded even before the cloak finished wrapping itself round him.
8. Killing Time
I
The usual way to explain it was by analogy; this was how the idea was introduced to you as a child. Imagine you were travelling through space and you came to this planet which was very big and almost perfectly smooth and on which there lived creatures who were composed of one layer of atoms; in effect, two-dimensional. These creatures would be born, live and die like us and they might well possess genuine intelligence. They would, initially, have no idea or grasp of the third dimension, but they would be able to live perfectly well in their two dimensions. To them, a line would be like a wall across their world (or, from the end, it would look like a point). An unbroken circle would be like a locked room.
Perhaps, if they were able to build machines which allowed them to journey at great speed along the surface of their planet — which to them would be their universe — they would go right round the planet and come back to where they had started from. More likely, they would be able to work this out from theory. Either way, they would realise that their universe was both closed, and curved, and that there was, in fact, a third dimension, even if they had no practical access to it. Being familiar with the idea of circles, they would probably christen the shape of their universe a «hypercircle» rather than inventing a new word. The three-dimensional people would, of course, call it a sphere.
The situation was similar for people living in three dimensions. At some point in any civilisation starting to become advanced it was realised that if you set off into space in what appeared to be a perfectly straight line, eventually you would arrive back at where you started, because your three-dimensional universe was really a four-dimensional shape; being familiar with the idea of spheres, people tended to christen this shape a hypersphere.
Usually around the same point in a society's development it was understood that — unlike the planet where the two-dimensional creatures lived — space was not simply curved into a hypersphere, it was also expanding; gradually increasing in size like a soap-bubble on the end of a straw which somebody was blowing into. To a four-dimensional being looking from far enough away, the three-dimensional galaxies would look like tiny designs imprinted onto the surface of that expanding bubble, each of them, generally, heading away from all the others because of the hypersphere's general expansion, but — like the shifting whorls and loops of colour visible on the skin of a soap bubble — able to slide and move around on that surface.
Of course, the four-dimensional hypersphere had no equivalent of the straw, blowing air in from outside. The hypersphere was expanding all by itself, like a four-dimensional explosion, with the implication that, once, it had been simply a point; a tiny seed which had indeed exploded. That detonation had created — or at least had produced — matter and energy, time and the physical laws themselves. Later — cooling, coalescing and changing over immense amounts of time and expansion — it had given rise to the cool, ordered, three-dimensional universe which people could see around them.
Eventually in the progress of a technologically advanced society, occasionally after some sort of limited access to hyperspace, more usually after theoretical work, it was realised that the soap bubble was not alone. The expanding universe lay inside a larger one, which in turn was entirely enclosed by a bubble of space-time with a still greater diameter. The same applied within the universe you happened to find yourself on/in; there were smaller, younger universes inside it, nested within like layers of paper round a much-wrapped spherical present.
In the very centre of all the concentric, inflating universes lay the place they had each originated from, where every now and again a cosmic fireball blinked into existence, detonating once more to produce another universe, its successive outpourings of creation like the explosions of some vast combustion engine, and the universes its pulsing exhaust.
There was more; complications in seven dimensions and beyond that involved a giant torus on which the 3-D universe could be described as a circle, contained and containing other nested tori, with further implications of whole populations of such meta-Realities… but the implications of multiple, concentric, sequential universes was generally considered enough to be going on with for the moment.
What everybody wanted to know was whether there was any way of travelling from one universe to another. Between any pair of universes there was more than just empty hyperspace; there was a thing called an energy grid. It was useful — strands of it could help power ships, and it had been used as a weapon — but it was also an obstacle, and — by all accounts so far — one which had proved impenetrable to intelligent investigation. Certain black holes appeared to be linked to the grid and perhaps therefore to the universe beyond, but nobody had ever made it intact into one, or ever reappeared in any recognisable form. There were white holes, too; ferociously violent sources spraying torrents of energy into the universe with the power of a million suns and which also seemed to be linked to the grid… but no body, no ship or even information had ever been observed appearing from their tumultuous mouths; no equivalent of an airborne bacteria, no word, no language, just that incoherent scream of cascading energies and super energetic particles.