Chapter Three — The Unbirthday Problem

The Continuum Chronicle · received by well · ABQ Terminus, General Delivery

As set down by Filament, Ninth Thread, Records Division, Continuum Post, and dispatched by well to TERRA, ABQ TERMINUS, GENERAL DELIVERY. Per natural law, this parcel carries one stowaway. Do not look for it. It will find you.

Every institution has one problem it keeps the way other institutions keep a founder’s portrait: framed, dusted, unsolved on purpose. Ours is the Unbirthday, and I have now spent four days in the Scheduling Office learning why three walls are devoted to it and why the fourth wall is not discussed, and I will tell you nearly everything.

First the physics, because the problem is honest and deserves to be stated honestly. Eight of the nine worlds keep musical time. That is not a figure of speech; it is the resonance chain, their years locked in ratios you could hum, and the whole postal system is built on the humming. Wells open when worlds chime. The Scheduling Office does not so much predict the windows as listen for them — the timetable is, in the strict sense, a score.

And then there is the Unbirthday, which rides a long comet’s ellipse out past everything and back, tail streaming away from the Kettle like hair out a carriage window. It has a day of arrival — this is the cruelty and the charm — it simply never falls on the same date twice. A world in the chain is a bell; the Unbirthday is a guest who knocks. And here is the detail the popular almanacs get wrong, the one the Office made me promise to state plainly: the variance is not sloppiness of measurement. A comet-world breathes. Sunward it warms and exhales — that streaming tail is the exhale — and every breath nudges the orbit, a little, one way or another. Astronomers on your world know this about your own comets and have the grace to be embarrassed about it. The Unbirthday’s return cannot be computed to the day because the Unbirthday has not finished deciding. It steers, slightly, by breathing. You cannot schedule a thing that is still making up its mind, and the Office will tell you — on the record, with a certain weary pride — that they have stopped regarding this as a flaw in the world and started regarding it as the world’s opinion.

Three walls, then. I inspected all three, escorted by the Under-Scheduler, a Vesper with ink-stained cuffs and the particular calm of someone who has been wrong professionally for forty years and is very good at it.

The first wall holds the attempts. A century of them: resonance extrapolations, breath-budget models, one heroic effort to weigh the exhale by measuring the tail’s shadow on Wallspeak. Each is annotated in the Office’s small red hand, and the annotations are the true exhibit, because they do not say FAILED. They say closer. The Office recalculates after every return, misses by less each time, and has a name for this discipline that I found filed in their own style-book and record here with archivist’s satisfaction: they call it the honest version of persistence. Not the stubborn version, which repeats itself; the honest one, which corrects.

The second wall holds the standing answer — the thing that actually works, and works precisely because it gives up the right thing. You cannot ring a bell for a guest, so the Post does not try. There is a well-mouth on the Glimmerward, under the auroras, kept open in the manner of a porch light: the Waiting Well, the only one in the system with no window, because it is all window. Mail for the Unbirthday goes down it whenever anyone likes and pools there, patient, sometimes for years. And when the Unbirthday comes sweeping in — whenever its breathing has brought it — its own well opens from their side, takes everything, and leaves everything outbound in a single glorious unscheduled heap. Delivery by consent rather than by appointment. The Office’s plaque over the second wall says it better than I can: WE DO NOT PREDICT THE GUEST. WE KEEP THE LIGHT ON.

The third wall is the one that turns the problem inside out, because it is about the passengers, and the passengers solved it first. Aboard the Unbirthday, no date ever comes twice — which means no anniversary can be kept, no birthday lands on its own day, nothing annual survives. A lesser people would grieve this. The Unbirthdayers, reasoning with a rigor I can only call Carrollian, observed that if the day of arrival is the only day that is ever the day, then every other day is not-the-day — and a not-the-day is worth a small celebration, on the grounds that there are so many of them and they are all irreplaceable. So they celebrate everything except arrival. Little feasts, constantly; presents given for no reason on the strict principle that no-reason is the reason; paper crowns as everyday wear. The one day nothing is celebrated is arrival day itself. It is their only quiet day. They spend it looking out the windows at whichever world they are passing, and the third wall of the Scheduling Office is covered — entirely — with the letters they post the morning after, which all begin, in one hand or another: You should have seen it.

Which brings us to the fourth wall, and to the limit of this report.

I asked. Of course I asked; asking is the job. The Under-Scheduler did not refuse, exactly. She set down her pen, and looked at the fourth wall — which is blank, reader, blank in a room where every other surface is a century deep in paper — and then she looked at me, and then, I record this exactly, she looked at you. Past my shoulder, through the parcel, at the reader. Held it a moment. Went back to work.

I have thought about it the whole way home, and I will file my finding, though the Office will neither confirm nor deny: three walls face the problem. The fourth wall faces the address. Every score needs somewhere the sound goes; every office that waits on an unschedulable guest keeps one wall bare for the direction the guest comes from. The Unbirthday is not the only thing in the system that arrives when it arrives, unannounced, breathing, still making up its mind. There is also, for instance, whoever is holding this page.

The Records Division has ruled my finding admissible and unproven, which is the Division’s highest compliment.

Erratum spent the entire visit asleep on the second wall’s plaque, directly across the word PREDICT, so that for four days it read WE DO NOT — WE KEEP THE LIGHT ON, and I am obliged to note that nobody in the Scheduling Office was in any hurry to move him.

Next chapter, windows willing: I have secured an interview with a carrier-cat of the Menagerie, seniormost on the moon routes. I am reliably informed the interview will consist of the cat declining to answer any questions whatsoever. The Division has approved the chapter anyway. We are, after all, an institution that keeps a porch light for a comet.

Celebrate a not-the-day this week. There are so many of them, and they are all irreplaceable.

Until the well opens again,