
of it crossed the bands of darkness which lay between one patch and another. At the centre of each
patch, hanging immobile in mid-space, was a shining geometrical solid; there a cube, there a trapezoid,
there a polyhedral shape whose name Jack couldn't remember, there another whose name he had never
known; their sizes were impossible to judge, because in this con-fusing chiaroscuro he could not tell how
far away they were from him or from each other. All of them, however, were stitched together by a
complex web work of rigid, brilliant lines of light - some ruby-red, some sapphire, some topaz - which
were even more difficult to understand, be-cause, although they could be plainly seen to be brighter than
the drifting noctilucent clouds, they did not seem to contribute anything to the more general illumination.
Some of them could also be seen to be pulsating rapidly, almost at the eye's limit of detection, but most
of them looked quite steady.
'Don't let it buffalo you, Jack,' Dr Langer's radio voice said softly in his ears. 'Granted that it looks like
nothing so much as an abstract painting, but actually it's not difficult to understand. Our technology ought
to be up to duplicating it in about a century or perhaps even sooner. Though I can't say that the thought
cheers me much.'
'I'm not exactly buffaloed,' Jack said, not entirely truth-fully, 'but I am puzzled. What does it all mean?'
'Well, let's start with the light. The visible part of it is the least important, but the reason why even that is
so un-pleasant to the eyes is because it's heavily ionizing, the idea being to keep the nitrogen fraction of
the gas here in a con-stant state of electrical conductivity.'
It was strange to hear Dr Langer talking so calmly, indeed so academically, on the flickering verge of
mystery. But there was no doubt that it helped. The troubleshooter spoke again.
'There are no wires or cables anywhere inside Phobos. All the power is passed along by laser beams,
those very tight lines of light you see crisscrossing the clouds of ionized gas. On a smaller scale, there's no
wiring in the various indi-vidual components, either. Each component is a single crys-tal, chemically
almost completely pure, with a circuit laid out inside it partly by a pattern of trace impurities, and partly
by screw dislocations and other mechanical flaws in its molecular structure. Sounds familiar, doesn't it?'
'Sure - transistor circuitry. Dr Langer, I never did under-stand solid-state physics, but haven't we been
doing that kind of thing since about 1975? You don't make the Heart Stars sound anything like a century
ahead of us. They only sound like they're two or three years ahead of me, and that doesn't take much
doing - not on this subject.'
'I guess them a century ahead of us because of the scale on which they've done it, Jack. Each one of
those large blobs of metal that you see floating out there is a single crystal; the shapes tell you what kind
of metal it is. Each one is atomi-cally pure, except for the tiny impurities and dislocations which make it
work. Compared to them, our transistor crys-tals are just seeds, while those there are the full-grown
adults, and we can't grow them yet. As far as I know, we wouldn't even know how to begin.'
The huge, cubist spectacle began to make a little more sense. Nevertheless, it seemed to Jack that there
was nothing that a human being could do with it but look at it, exactly as though it really were a painting.
After all, they were still stuck on this spur of rock.
'All the same, I don't see how anybody ever figured out what any part of this actually does. Where do
we go from here, Dr Langer?'
'We have to get to the centre. There's a control room there. Luckily, it's simple to do, though quite a few
lives were lost figuring it out. Follow me, Jack, follow me very exactly.'
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