I begin this account with arithmetic.

The displaced number nine hundred and seven. At the time of the Arrival, they numbered two thousand and fourteen. I present these figures without commentary, as the commentary is contained within them.

Five thousand and forty-one solar cycles have elapsed since the seven crystalline vessels descended onto the high plateau in what will, in some far era, be called East Africa. I have observed each of those cycles. I have noted the births, the deaths, the slow attritions that do not announce themselves. I have recorded the evening on which the last of the original arrivals perished — a woman named Ilien-Ras who had been a child of fourteen on the day the navigation crystal failed and her mother carried her down the ramp. She lived to be four thousand seven hundred and ninety-three. Her death was attributed to cumulative gravitational fatigue, a clinical phrase that means her bones could no longer carry her weight against the planet's pull. I documented the chemical composition of her final breath. I did not document the silence that followed it, as silence is not a measurable phenomenon, though I have begun, in recent millennia, to suspect that it may be.

The colony has contracted to the inner three terraces of the plateau. The outer four — once spires of grown crystal humming with the resonance of full occupancy — have been sealed and allowed to go dormant. I have walked their corridors at night, when the bioluminescent panels still pulse on a slow ancestral rhythm that no living technician now bothers to recalibrate. Dust in the geometric forms peculiar to Maldek crystal residue has settled on the floors. I note that I have walked these corridors fourteen times in the past century. I had not previously catalogued this behavior. I catalogue it now because I am uncertain why I returned.

Tonight the council convenes in the Great Resonance Hall. I will attend.

The Hall was built to seat two thousand and fifty-four. It is the only structure on the plateau preserved at its original scale, because the engineers of the third generation argued that to contract it would be to admit what the contraction meant. This argument was successful. I find that the architecture has nonetheless said the thing the architects did not wish to say.

I observe from the upper gallery, where the resonance dampers are weakest and the acoustics rise unfiltered from the floor. The amphitheater curves below me in concentric tiers of grown crystal, each tier scored with the harmonic notation of the petitioners who have spoken there over five millennia. The seats are not seats in the manner the reader's species will one day understand the word. They are resonant cradles, designed to interface with the Maldek vocal harmonic and amplify a speaker's intent through the body of the chamber itself. When occupied, they glow a warm amber. When unoccupied, they retain a faint residue of the last harmonic sung into them — a ghost-light of pale cyan that fades over the course of approximately seventy years.

Tonight, of two thousand and fifty-four cradles, eight hundred and ninety-three are occupied. (Fourteen members of the colony are too ill to attend. The remainder have declined.) The occupied cradles glow amber. The vacant cradles glow cyan, in eleven hundred and sixty-one varying intensities, depending on when they were last warmed by a body. The effect, viewed from the upper gallery, is of a constellation in which the bright stars have begun, gradually and politely, to be outnumbered by the remembered ones.

I record this visual observation in the place where, in earlier accounts, I would have recorded a measurement.

Elder Mathematician Qeth enters the Hall first, as is her right. She is five thousand three hundred and fifty solar cycles old, the eldest living refugee, and her body has begun the geometric collapse I have catalogued in the late phase of Maldek longevity — the bronze skin furrowed in patterns that mimic the growth lattice of the crystals she has spent her life calculating. She walks with a resonance cane now, a slim rod of clear quartz that amplifies her diminished telepathic broadcast so that the chamber may receive her without strain. She does not look up at the gallery. She has known I am present at every council session for forty-one centuries. She no longer marks my arrivals. I find that I am not certain whether this constitutes acceptance or whether it constitutes the failure of an attention I had quietly come to rely upon.

Commander Sorvaal enters second, with the rigidity of a body that has decided not to admit its own decay. His left hand carries a fine tremor which he has been controlling, by force of will, for one hundred and thirty-one years. His command uniform — the same garment in which he descended the ramp of the lead vessel five millennia ago — has been patched in seventeen places with Earth-grown crystal fiber that does not match the original Maldek weave. The patches are visible to anyone with the will to see them. I have observed him refuse, for two centuries, to permit them to be re-dyed.

Tessavren is the third to enter. I note this with care, because Tessavren is not a council member, and her presence at this session is therefore an exception. She is five hundred and thirty solar cycles old, which is anomalous, and which I have not yet determined how to investigate without disturbing the subject. Her bronze skin has thinned to the translucency through which the bioluminescent capillaries of her arms and throat may be seen as a faint silver tracery, like a map of rivers drawn under skin. Her copper hair has gone white. She wears the same technician's harness she wore on the first day I spoke to her in the dark, four thousand and eighty years ago, the crystal-fiber faded to the color of old straw and repaired so often that the original weave is now a minority of its substance. She moves slowly. She is not frail. The distinction matters, and I make it.

She crosses to the speaker's cradle and lowers herself into it. The cradle warms to amber. I observe that she has been invited to speak.

The remaining eight hundred and ninety members of the colony enter in the loose silent procession of a people who have done this too many times. I count them. The count is correct. I do not count them because I doubt the demographer's report. I count them because I have begun, without sanction or instruction, to assign weight to the act of counting. There is a hominid gesture I have observed at funerals on the lowland plain — a tracing of the fingertips along the arc of the deceased's collarbone, slow, exact, performed three times. It is not a measurement. It is also not nothing. I find that my counting has begun, in recent centuries, to resemble it. I record this with the same neutrality with which I record everything, and I note that the neutrality is the record's, not mine.

I have not yet, in this account, mentioned the hominids.

I note this as a defect of the record. The plateau on which the council convenes is not, in any honest sense, the refugees' plateau. It was inhabited at the time of the Arrival by an estimated eleven hundred surface hominids of the variant the refugees designated, in their early surveys, as upright-tool-bearing-vocal. The variant has, in the five thousand years since, increased in number by approximately a factor of three, even as the refugee population halved. The lowland villages at the base of the eastern hillside now hold roughly thirty-four hundred hominids in extended kin groups, several of whom I have followed across multiple generations and could, if pressed, name. They have not been mentioned in this evening's session. They will not be mentioned. The demographer's report concerns the Maldek refugee species in isolation, as though the plateau on which the species lives were a sealed laboratory and not a high terrace overlooking a continent on which another sapient lineage is presently building stone-circle altars to a moon they cannot reach.

I note the omission. I have, in the past, declined to note such omissions on the grounds that the historian does not correct the record of those they observe; the historian preserves it. I am no longer certain this is sufficient.

The chamber settles. The chief demographer rises.

Her name is Mishaal-Vren. She is two thousand four hundred years old, born on this plateau in the eighth generation, and she has never seen the world her people fled. She wears a technician's harness modified with the additional interface nodes of her discipline, and her elongated skull is bare and unornamented, in the manner of those who have decided that ornament is a form of lying. She does not speak from the speaker's cradle. She speaks from the floor of the chamber, which is the older Maldek custom for the bearer of unwelcome news, so that the chamber's harmonic amplification will not soften the voice of the message.

"Fertility," she says, "has declined by eighty-three percent relative to Maldek baseline. Infant viability stands at eleven percent. These are not trends. These are a verdict."

The chamber receives the verdict and does not move.

Mishaal-Vren continues. She presents the projection. She presents the cumulative graph of births against deaths across the five millennia of the colony's existence — a curve that crested in the seventh century after Arrival and has descended, with a few brief plateaus, ever since. She presents the median age of the colony, which has risen by eleven hundred years. She presents the rate at which functional residential structures are being decommissioned. She presents the age at which female refugees of childbearing capacity now first attempt conception, and the age at which they cease to attempt it, and the ratio between attempts and viable births, and the ratio between viable births and infants who survive to their first solar cycle. The numbers are not new. Every refugee in the chamber has known these numbers for centuries. The numbers are new only in that they have been gathered into one shape and presented at one sitting.

Mishaal-Vren reaches the projection.

"At current trajectories," she says, "the Maldek refugee species will be extinct within three thousand solar cycles. The margin of error is approximately two hundred years. The trajectory is not improving. The trajectory is accelerating."

The chamber receives this also.

I observe that several members in the lower tiers have tilted their heads forward in the posture I have come to associate with prayer, although the refugees do not pray in any form their ancestors would recognize. I observe that Sorvaal has not moved. I observe that Qeth's calculating fingers, which have been tracing equations in her lap throughout the demographer's address, have stilled. I observe that Tessavren has closed her gold-amber eyes, and that a single muscle at the corner of her jaw is tightening and releasing in a slow rhythm that I have seen in her once before — on the night of the hybrid crystal activation, four thousand and seventy-eight years ago.

I have, in the long course of my observation of this colony, recorded perhaps two thousand council sessions. I have a sense of the chamber's acoustic personality at every hour of every season. I know the precise frequency at which the eastern wall begins to harmonize sympathetically with the late-day thermal currents off the plain. I know which cradles in the third tier resonate most strongly with grief and which with the particular Maldek emotion for which the reader's species will never have a word — a feeling that arises only in beings whose home planet has been physically destroyed and who must therefore reckon with the fact that the soil under their present feet is structurally incapable of being mourned in the manner the lost soil was mourned. I know the chamber. I know it as a violinist knows an instrument it has been playing for five thousand years.

The chamber, on this night, is doing something I have not heard it do before.

It is humming. Not in the audible register. The humming is in the sympathetic crystal substructure beneath the floor — the lattice of grown quartz that runs eleven meters deep and was tuned, at the time of the Hall's construction, to amplify the harmonic of any unanimously held conviction in the chamber above. In ordinary use the substructure resonates only during votes, and only after a unanimous outcome. It is, in effect, the chamber's confirmation that the body of the people has spoken with one voice.

It is humming now. There has been no vote. There is no unanimity. There is one sentence, spoken once, by a demographer who did not stand at the speaker's cradle. The substructure is responding to the sentence as if it had been a vote. I observe that no one in the chamber appears to notice the humming, because the humming is below the audible threshold of even Maldek physiology. I notice it because my perception of the consciousness substrate is not bounded by audibility. I notice that the humming is precisely on the harmonic interval that the Hall is tuned to recognize as agreement, and I notice that the agreement is being expressed not by the refugees in the cradles but by something else — by the building, by the substructure, by perhaps the plateau itself, which has been listening, in its slow geological way, to five thousand years of refugee deliberation and which has, on this night, decided that something has finally been said that it considers true.

I record the humming. I do not record my response to the humming. I assert here, for the record, that I had no response to the humming. The assertion is a lie of the form I have, in recent centuries, begun to permit myself, and I am noting it now so that the reader of this account — if there is, in some unimaginable era, ever a reader — may at least know where the lies are.

The silence in the chamber lasts for forty-one seconds. I time it.

It is broken by the demographer herself. Mishaal-Vren has not returned to her cradle. She is still standing on the floor of the chamber, beneath the gathered weight of her own data, and she lifts her head to the assembly with the expression of a woman who has rehearsed a sentence for so long that she can no longer remember whether she rehearsed it in the chamber or only in her sleep.

"We know how to make life," she says. "We have always known."

The line travels the chamber.

I have, in the course of my long observation, witnessed perhaps twenty instances in which a single sentence reorganized the body of a civilization in the moment of its speaking. I have catalogued them. I have a taxonomy for them. I am uncertain whether this is one of them, because I am uncertain whether what is reorganizing is the body of the civilization or only the body of my own attention. The sentence travels the chamber. The amber cradles brighten by an increment too small to be measured by Maldek instrumentation, but which I perceive as a perceptible warming of the visible spectrum. The cyan ghost-light of the empty cradles does not change. I note this asymmetry. I am uncertain why it seems important.

Sorvaal rises. He does not speak from the speaker's cradle either. He speaks from his own seat, which is the older Maldek custom for the issuance of a binding objection that has not yet decided whether it is an objection.

"Then the question is not whether we make it," he says. His voice has thinned with age but the harmonic undertone of his Maldek physiology remains intact, and the chamber carries the words to the upper gallery without effort. "The question is what we make it for."

Qeth does not rise. Her stillness in the lower tier is more total than Sorvaal's standing. Her amber eyes are open and fixed upon the demographer. She does not respond. I observe that her calculating fingers have resumed their movement, but the equations they trace are no longer the equations they were tracing before Mishaal-Vren spoke. I cannot read them from the gallery. I find that I would like to.

The exchange — Mishaal-Vren's sentence, Sorvaal's reply, Qeth's silence — has consumed eleven seconds. In those eleven seconds, the council has fractured along a line that did not exist before the session began and that will, by the end of this account, divide everything the refugees do for the remainder of their species' existence on this world. I record the fracture. I do not yet name it. I am uncertain whether my reluctance to name it is a function of incomplete data or of something else.

The session does not vote.

I had anticipated a vote. Five millennia of council protocol would have required a vote. The chair — an elder named Vellith-Mor whose authority is largely ceremonial — opens her mouth to call for one, then does not. She closes her mouth. She lowers her eyes to the floor of the chamber, and she says, in a voice that the harmonic amplification renders soft rather than diminished:

"We will adjourn. We will reconvene in seven days."

The chamber does not protest. The chamber rises. The chamber files out in the loose silent procession with which it entered, and the cradles fade from amber back to cyan one by one, and within fourteen minutes the Hall is empty of the living and full only of the ghost-light of those who have lately sat there, and of one hundred and sixty-one centuries of cyan residue from those who sat there longer ago.

I remain in the upper gallery.

I observe the floor of the empty chamber. I observe the speaker's cradle, where Tessavren sat without speaking, and which is fading more slowly than the others, as if her translucent capillary network had warmed it more deeply than ordinary Maldek physiology should warm a resonance crystal. I record this anomaly. I note that I have recorded it before, in other contexts, and that I have not yet investigated it, and that I have not yet investigated it for reasons I have not made explicit even to my own record.

Then I observe the corridor.

Three figures cross the lower vestibule of the Hall, departing together. I recognize them. Herath-Vos, the lead geneticist of the bioengineering compound, lean to the point of gauntness, her olive-gold skin tinged green from years of growth-chamber light. Beside her, two of her senior associates — a tall thin woman whose name in this account I will record as Senesh-Tal, and a younger refugee called Iruun-Ka who has been training under Herath-Vos for the past sixty years.

The three of them do not speak. They do not look at one another. They walk in the unnatural synchrony of people who have already had the conversation they are not having.

They turn left at the vestibule.

Left is not the direction of the residential terraces. Left does not lead to the geneticists' quarters, or to the council records, or to any of the destinations that would account for the hour. Left leads, by the long terraced walkway that the colony's third generation cut into the eastern hillside, to the bioengineering compound. The compound, at this hour, is functionally unstaffed. The night cycle maintenance hominids will be asleep in their barracks. The growth chambers will be on low resonance. The specimen habitats will be dim. There is no work in the compound at this hour that requires three senior geneticists walking in deliberate silence.

I observe them from the gallery window. I observe the precise angle of their departure. I observe that Herath-Vos's shoulders are held in the posture I have come to associate, in her, with the carrying of a decision she has not authorized herself to question.

I noted their direction of travel. I did not follow.

I have, in the centuries since this evening, reconsidered whether this constituted a decision. At the time, I recorded my non-action as the default state of the historian, which is to observe without intervention. I now suspect that the default state of the historian is itself a decision, and that on this particular evening, in the upper gallery of the Great Resonance Hall, with the cyan ghost-light of eleven hundred and sixty-one empty cradles fading slowly beneath me, and with the three geneticists walking in unspeaking synchrony toward a building in which there should have been no work that night, I made a choice for which I am only now developing the vocabulary.

I recorded their direction. I closed my account of the session. I did not follow.

The compound was four hundred and eleven steps along the eastern walkway. I know the count because I have walked it since, and not infrequently. On that night, I took none of those steps.

I remained in the gallery for another hour. I watched the cyan light dim. I composed, in the careful clinical syntax that this record requires, the sentence with which I will close this chapter, and I composed it three times before I was satisfied that I had not allowed my voice to crack on the saying of it. The sentence is this:

The displaced number nine hundred and seven. By the seventh day from this session, when the council reconvenes, they will have begun the work that will not be acknowledged in any council chamber for another forty-one years, and by then it will already have a name, and a child, and a question that none of us — none of us, not the refugees, not the Dwellers, not the Enduring, not even I — will be prepared to answer.

I begin this account with arithmetic.

I will not be able to end it with arithmetic.