1

The northern polar island had suffered perhaps more deformation than any other landscape on Mars; so Sax had heard, and now walking on a bluff edging the Chasma Borealis River, he could see what they meant. The polar cap had melted by about half, and the massive ice walls of Chasma Borealis were mostly gone. Their departure had been a thaw unlike any seen on Mars since the middle Hesperian, and all that water had rushed every spring and summer down the stratified sand and loess, cutting through them with great force. Declivities in the landscape had turned into deep sand-walled canyons, cutting downstream to the North Sea in very unstable watersheds, channelizing subsequent spring melts and shifting rapidly as slopes collapsed and landslides created short-lived lakes, before the dams were cut through and carried off in their turn, leaving only beach terraces and slide gates.

Sax stood looking down on one of these slide gates now, calculating how much water must have accumulated in the lake before the dam had broken. One couldn’t stand too close to the edge of the overlook, the new canyon rims were by no means stable. There were few plants to be seen, only here and there a strip of pale lichen color, providing some relief from the mineral tones. The Borealis River was a wide shallow wash of tumbling glacial milk, some hundred and eighty meters below him. Tributaries cut hanging valleys much less deep, and dumped their loads in opaque waterfalls like spills of thin paint.

Up above the canyons, on what had been the floor of Chasma Borealis, the plateau was cut with tributary streams like the pattern of veins in a leaf. This had been laminated terrain to begin with, looking as if elevation contours had been artfully incised into the landscape, and the stream cuts revealed that the French curve laminae went down many meters, as if the map had marked the territory to a great depth.

It was near midsummer, and the sun rode the sky all day long. Clouds poured off the ice to the north. When the sun was at its lowest, the equivalent of midafternoon, these clouds drifted south toward the sea in thick mists, colored bronze or purple or lilac or some other vibrant subtle shade. A thin scattering of fellfield flowers graced the laminate plateau, reminding Sax of Arena Glacier, the landscape that had first caught his attention, back before his incident. That first encounter was very difficult for Sax to remember, but apparently it had imprinted on him in the way ducklings imprinted on the first creatures they saw as their mothers. There were great forests covering the temperate regions, where stands of giant sequoia shaded pine understories; there were spectacular sea cliffs, home to great clouds of mewling birds; there were crater jungle terraria of all kinds, and in the winters there were the endless plains of sastrugi snow; there were escarpments like vertical worlds, vast deserts of red shifting sands, volcano slopes of black rubble, there was every manner of biome, great and small; but for Sax this spare rock bioscape was the best.

He walked along over the rocks. His little car followed as best it could, crossing the tributaries of the Borealis upstream at the first car ford. The summertime flowering, though hard to pick out if one were more than ten meters away, was nevertheless intensely colorful, as spectacular in its way as any rain forest. The soil created by these plants in their generations was extremely thin, and would thicken only slowly. And augmenting it was difficult; all soil dropped in the canyons would wind up in the North Sea, and on the laminate terrain the winters were so harsh that soil availed little, it only became part of the permafrost. So they let the fellfields grow in their own slow course to tundra, and saved the soil for more promising regions in the south. Which was fine by Sax. It left for everyone to experience, for many centuries to come, the first areobiome, so spare and un-Terran.

Trudging over the rubble, alert for any plant life underfoot, Sax veered toward his car, which was now out of sight to his right. The sun was at much the same height it had been all day, and away from the deep narrow new Chasma Borealis running down the broad old one, it was very hard to keep oriented; north could have been anywhere across about one hundred and eighty degrees: basically, “behind him.” And it would not do to walk casually into the vicinity of the North Sea, somewhere ahead of him, because polar bears did very well on that littoral, killing seals and raiding rookeries.

So Sax paused for a moment, and checked his wristpad maps to get a precise fix on his position and his car’s. He had a very good map program in his wristpad these days. He found he was at 31.63844 degrees longitude, 84.89926 degrees north latitude, give or take a few centimeters; his car was at 31.64114, 84.86857; if he climbed to the top of this little breadloaf knoll to the west northwest, up an exquisite natural staircase, he should see it. Yes. There it rolled, at a lazy walking pace. And there, in the cracks of this breadloaf (so apt, this anthropomorphic analogizing) was some small purple saxifrage, stubbornly hunkering down in the protection of broken rock.

Something in the sight was so satisfying: the laminate terrain, the saxifrage in the light— the little car moving to its dinner rendezvous with him— the delicious weariness in his feet— and then something indefinable, he had to admit it— unexplainable— in that the individual elements of the experience were insufficient to explain the pleasure of it. A kind of euphoria. He supposed this was love. Spirit of place, love of place— the areophany, not only as Hiroko had described it, but perhaps as she had experienced it as well. Ah, Hiroko— could she really have felt this good, all the time? Blessed creature! No wonder she had projected such an aura, collected such a following. To be near that bliss, to learn to feel it oneself . . . love of planet. Love of a planet’s life. Certainly the biological component of the scene was a critical part of one’s regard for it. Even Ann would surely have to admit that, if she were standing there beside him. An interesting hypothesis to test. Look, Ann, at this purple saxifrage. See how it catches the eye, somehow. One’s regard focused, in the center of the curvilinear landscape. And so love, spontaneously generated.

Indeed this sublime land seemed to him a kind of image of the universe itself, at least in its relation of life to nonlife. He had been following the biogenetic theories of Deleuze, an attempt to mathematicize on a cosmological scale something rather like Hiroko’s viriditas. As far as Sax could tell, Deleuze was maintaining that viriditas had been a threadlike force in the Big Bang, a complex border phenomenon functioning between forces and particles, and radiating outward from the Big Bang as a mere potentiality until second-generation planetary systems had collected the full array of heavier elements, at which point life had sprung forth, bursting in “little bangs” at the end of each thread of viriditas. There had been none too many threads, and they had been uniformly distributed through the universe, following the galactic clumping and partly shaping it; so that each little bang at the end of a thread was as far removed from the others as it was possible to be. Thus all the life islands were widely separated in timespace, making contact between any two islands very unlikely simply because they were all late phenomena, and at a great distance from the rest; there hadn’t been time for contact. This hypothesis, if true, seemed to Sax a more than adequate explanation for the failure of SETI, that silence from the stars that had been ongoing for nearly four centuries now. A blink of the eye compared to the billion light-years that Deleuze estimated separated all life islands each a tertiary emergent phenomenon.

So viriditas existed in the universe like this saxifrage on the great sand curves of the polar island: small, isolate, magnificent. Sax saw a curving universe before him; but Deleuze maintained that they lived in a flat universe, on the cusp between permanent expansion and the expand-contract model, in a delicate balance. And he also maintained that the turning point, when the universe would either start to shrink or else expand past all possibility of shrinking, appeared to be very close to the present time! This made Sax very suspicious, as did the implication in Deleuze that they could influence the matter one way or the other: stomp on the ground and send the universe flying outward to dissolution and heat death, or catch one’s breath, and pull it all inward to the unimaginable omega point of the eschaton: no. The first law of thermodynamics, among many other considerations, made this a kind of cosmological hallucination, a small god’s existentialism. Psychological result of humanity’s suddenly vastly increased physical powers, perhaps. Or Deleuze’s own tendencies to megalomania; he thought he could explain everything.

In fact Sax was suspicious of all the current cosmology, placing humanity as it did right at the center of things, time after time. It suggested to Sax that all these formulations were artifacts of human perception only, the strong anthropic principle seeping into everything they saw, like color. Although he had to admit some of the observations seemed very solid, and hard to accept as human perceptual intrusion, or coincidence. Of course it was hard to believe that the sun and Luna looked exactly the same size when seen from Earth’s surface, but they did. Coincidences happened. Most of these anthropocentric features, however, seemed to Sax likely to be the mark of the limits of their understanding; very possibly there were things larger than the universe, and others smaller than strings— some even larger plenum, made of even smaller components— all beyond human perception, even mathematically. If that were true it might explain some of the inconsistencies in Bao’s equations— if one allowed that the four macrodimensions of timespace were in relation to some larger dimensions, like the six microdimensions were to their ordinary four, then the equations might work quite beautifully— he had a vision of one possible formulation, right there—

He stumbled, caught his balance. Another small bench of sand, about three times the size of the normal one. Okay— on and up to the car. Now what had he been thinking about?

He couldn’t remember. He had been thinking something interesting, he knew that. Figuring something out, it seemed like. But try as he might, he couldn’t recall what it was. It bulked at the back of his mind like a rock in his shoe, a tip-of-the-tongueism that never came through. Most uncomfortable; even maddening. It had happened to him before, he seemed to recall— and more frequently recently, wasn’t that true? He wasn’t sure, but that felt right. He had been losing his train of thought, and then been unable to retrieve it, no matter how hard he tried.

He reached his car without seeing his walk there. Love of place, yes— but one had to be able to remember things to love them! One had to be able to remember one’s thoughts! Confused, affronted, he clattered about the car getting a dinner together, then ate it without noticing.

This memory trouble would not do.

• • •

Actually, now that he thought of it, losing his train of thought had been happening a lot. Or so he seemed to remember. It was an odd problem that way. But certainly he had been aware of losing trains of thought, which seemed, in their blank aftermath, to have been good thoughts. He had even tried to talk into his wristpad when such an accelerated burst of thinking began, when he felt that sense of several different strands braiding together to make something new. But the act of talking stopped the mentation. He was not a verbal thinker, it seemed; it was a matter of images, sometimes in the languages of math, sometimes in some kind of inchoate flow that he could not characterize. So talking stopped it. Or else the lost thoughts were much less impressive than they had felt; for the wrist recordings had only a few phrases, hesitant, disconnected, and most of all slow— they were nothing like the thoughts he had hoped to record, which, especially in this particular state, were just the reverse— fast, coherent, effortless— the free play of the mind. That process could not be captured; and it struck Sax forcibly how little of anyone’s thinking was ever recorded or remembered or conveyed in any way to others— the stream of one’s consciousness never shared except in thimblefuls, even by the most prolific mathematician, the most diligent diarist.

So, well; these incidents were just one of the many conditions they had to adapt to in their unnaturally prolonged old age. It was very inconvenient, even irritating. No doubt the matter ought to be investigated, although memory was a notorious quagmire for brain science. And it was somewhat like the leaky-roof problem; immediately after such a lost train of thought, with the absent shape of it still in his mind, and the emotional excitation, it almost drove him mad; but as the content of the thought was forgotten, half an hour later it did not seem much more significant than the slipping away of dreams in the minutes after waking. He had other things to worry about.

• • •

Such as the death of his friends. Yeli Zudov this time, a member of the First Hundred he had never known well; nevertheless he went down to Odessa, and after a memorial service, a lugubrious affair during which Sax was frequently distracted by thoughts of Vlad, of Spencer, of Phyllis, and then of Ann— they returned to the Praxis building, and sat in Michel and Maya’s apartment. It was not the same apartment they had lived in before the second revolution, but Michel had taken pains to make it look much the same, as far as Sax could recall— something about Maya’s therapy, as she was having more and more mental trouble— Sax wasn’t sure what the latest was. He had never been able to deal with the more melodramatic aspects of Maya, and he hadn’t paid overmuch attention to Michel’s talk about her when the two of them last got together— it was always different, always the same.

Now, however, he took a cup of tea from Maya, and watched her go back into the kitchen, past the table on which Michel’s scrapbooks were spread. Face up was a photo of Frank that Maya had treasured long ago; she had had it taped to the kitchen cabinet by the sink, in the apartment down the hall— Sax remembered that most clearly, it was a kind of heraldic feature of those tense years: all of them struggling while the young Frank laughed at them.

Maya stopped and looked down at the photo, stared at it closely. Remembering their earlier dead, no doubt. Those who had gone before, so very long ago.

But she said, “What an interesting face.”

Sax felt a chill in the pit of his stomach. So distinct, the physiological manifestations of distress. To lose the substance of a speculative train of thought, a venture into the metaphysical— that was one thing. But this— her own past, their past— it was insupportable. Not to be abided. He would not abide it.

Maya saw they were shocked, though she did not know why. Nadia had tears in her eyes, not a common sight. Michel looked stricken. Maya, sensing something seriously wrong, fled the apartment. No one stopped her.

The others picked up the place. Nadia went to Michel.

“More and more like that,” Michel muttered, looking haunted. “More and more. I feel it myself. But for Maya. . . .” He shook his head, looking deeply discouraged. Even Michel could make nothing good of this, Michel who had worked his alchemy of optimism on all their previous reversals, making them part of his great story, the myth of Mars that he had somehow wrenched out of the daily morass. But this was the death of story. Thus hard to mythologize. No— living on after the memory died was mere farce, pointless and awful. Something was going to have to be done.

• • •

Sax was still thinking about this, sitting in a corner absorbed in his wristpad, reading a collection of abstracts from recent experimental work on the memory, when there came a thump from the kitchen and a cry from Nadia. Sax rushed in to find Nadia and Art crouched over Michel, who lay white-faced on the floor. Sax called the concierge, and faster than he would have imagined possible an emergency crew had barged in with their equipment and shouldered Art aside, big young natives who brusquely encased Michel into their compact web of machinery, leaving the old ones as spectators only of their friend’s— struggle.

Sax sat down among the medics, in their way, and put a hand to Michel’s neck and shoulder. Michel’s breathing had stopped, his pulse as well. White-faced. The resuscitation attempts were violent, the electrical shocks tried at a variety of strengths, the subsequent shift to heart-lung machine accomplished with a minimum of fuss; and the young medics worked in near silence, talking among themselves only when necessary, seemingly unaware of the old ones sitting against the wall. They did all they could; but Michel remained stubbornly, mysteriously dead.

Of course he had been upset by Maya’s memory failure. But this did not seem an adequate explanation. He had already been aware of Maya’s problem, none more so, and he had been worried; so any single display of her problem shouldn’t have mattered. A coincidence. A bad one. And of course eventually— quite late that evening, actually, after the doctors had finally given up, and taken Michel downstairs, and were clearing out their equipment— Maya returned, and they had to tell her what had happened.

She was distraught, naturally. Her shock and anguish were too much for one of the young medics, who tried to comfort her (that won’t work, Sax wanted to say, I’ve tried that myself) and got himself struck in the face for his pains, which made him angry; he went out in the hall, sat down heavily.

Sax went out and sat beside him. He was weeping.

“I can’t do this anymore,” the man said after a while. He shook his head, seemingly apologetic. “It’s pointless. We come and do all we can and it makes no difference. Nothing stops the quick decline.”

“Which is?” Sax said.

The young man shrugged his massive shoulders, sniffed. “That’s the problem. No one knows.”

“Surely there must be theories? Autopsies?”

“Heart arrhythmia,” said one of the other medics curtly as he passed by with some equipment.

“That’s just the symptom,” the sitting man snarled, and sniffed again. “Why does it go arrhythmic? And why doesn’t CPR restart it?”

No one answered.

Another mystery to be solved. Through the door Sax could see Maya crying on the couch, Nadia beside her like a statue of Nadia. Suddenly Sax realized that even if he found an explanation, Michel would still be dead.

Art was dealing with the medics, making arrangements. Sax tapped at his wrist and looked at a list of titles for articles on quick decline; 8,361 titles in this index. There were literature reviews, and tables assembled by AIs, but nothing that looked like a definitive paradigm statement. Still at the stage of observation and initial hypothesis . . . flailing. In many ways it resembled the work on memory Sax had been reading. Death and the mind; how long they had studied these problems, how long the problems had resisted! Michel himself had commented on that, implying some deeper narrative that explained their unexplainables— Michel who had brought Sax back from aphasia, who had taught him to understand parts of himself he hadn’t even known existed. Michel was gone. He wouldn’t be back. They had carried the last version of his body out of the apartment. He had been around Sax’s age, about 220 years old. It was an advanced age by any previous standard; why then this pain in Sax’s chest, this hot blur of tears? It didn’t make sense. But Michel would have understood. Better this than the death of the mind, he would have said. But Sax wasn’t so sure; his memory problems seemed less important now, Maya’s as well. She remembered enough to be devastated, after all. Him too. He remembered what was important.

Strange to recall: he had been in her company immediately in the wake of the death of all three of her consorts. John, Frank, now Michel. Each time it got worse for her. And the same for him.

• • •

Michel’s ashes, up in a balloon over the Hellas Sea. They saved a pinch for return to Provence.