At six forty on the morning of the Watching Day, before the data shift had even changed hands, Lin Wanzhao had already pulled the night's three hours of underhum records into her comparison window. The signal had been sitting underneath every man-made signal for thirty years. It took up no channel, grabbed no power; once every Watching Day it rose along a predictable arc, held, and sank back. Station protocol required the duty officer to log the amplitude of the rise, and she wrote: three point seven decibels, phase normal, no crosstalk. She filed the page where it belonged and went to fetch hot water.
The boiler room was at the end of the corridor. A heating pipe crossed the ceiling, and every so often it knocked three times, paused, knocked three times again. Old Tang from the boiler room said the pipes in this building had air in them that would never bleed out — eleven years of knocking now. Lin Wanzhao had counted while filling her cup: three, a pause, three. Nothing to do with the data, nothing to do with anything. Xiao Jiang from her shift leaned over to look at her Watching Day log and offered a five-yuan bet that tonight's rise would break four. She said she didn't bet. Xiao Jiang said, you don't bet because you know. She said, I don't bet because it's five yuan. Old Tang came through between them with his mop, dragged two passes over the wet patch by the door, then leaned against the door frame and rested a while, saying nothing.
At ten the station forwarded the routine bulletin from the Window Period Administration: Watching Day today; all monitoring units beware equipment overload; no anomalous items. Hundreds of these bulletins had gone out over thirty years, the wording never changed. Lin Wanzhao archived it as always, and while archiving glanced at the folder's properties: one thousand one hundred and seventy files. She closed the properties box and mentioned the number to no one.
Before the three o'clock handover she went down to the archive room and pulled the Watching Day rise records from twelve full years out of the last thirty, and laid them over last night's curve. Twelve years, one hundred and forty-four Watching Days, and the arcs overlapped to a degree that made newcomers uneasy. Old Tang's generation called it keeping faith; the station's official phrase was periodic stability. Xiao Jiang once said the thing hadn't changed its waveform once in thirty years, more dependable than a mother-in-law. The room laughed its way around, then went back to work — detections to run, tea to drink. Lin Wanzhao refiled the twelve years of curves and, before filing, made one extra backup into cold storage. The cold-storage cabinet stood at the very back of the archive room, and next to the keyhole was a faded label reading NO BACKUPS UNLESS NECESSARY, in the hand of the previous station chief, transferred away seven years ago. She straightened the label when she was done.
At twelve twenty her phone rang: Zhou Shu's school. Teacher Mu, the homeroom teacher, her voice arriving under the tail end of the playground broadcast, said that this morning had been the monthly Watching Day sampling class, school-wide recording, it was an obligation, the parents' notices had all been signed at the start of term. Lin Wanzhao said she knew. Teacher Mu said that in the seventh minute of the recording, Zhou Shu had said a word along with it. Lin Wanzhao asked, what word. Teacher Mu said, I couldn't make it out — her voice was very small, but the microphone caught it; on playback you could see the waveform move once. Lin Wanzhao asked, what was the conclusion of the playback review. Teacher Mu paused on the other end and said the review was done by the Bureau; the school only tracked attendance. She said, all right, thank you, teacher. Teacher Mu said, keep the notice, it may be needed later, it may not — that's all I'll say for now. The call ended.
Everyone telling their own piece of it. The feeling only surfaced after she hung up, and there was nowhere to put it.
In the afternoon she logged in to the family side of the sampling class; parents had access to their own child's raw audio. The file was forty minutes. The first six and a half were classroom ambience: chair legs, pages turning, someone swallowing a cough halfway through. At seven minutes four seconds there was a small bump on the waveform, lasting under a second. She enlarged that one second, ran a spectrum, and aligned it against last month's sample from the same classroom. The instrument gave her what she expected: a stretch of human voice, very low volume, within the normal range of a child's vocal tract, and nothing else besides. Semantics do not reside in the signal — that had been settled thirty years ago, in a book she'd read in college, underlining in the margins. She trusted instruments. The instrument said: a little girl said something for half a second. Nothing more.
The problem was that she had been that little girl once herself.
She drew a kraft-paper envelope from the bottom shelf of the bookcase: Zhou Shu's physical exam booklets, one a year, from birth to now. In the most recent one she turned to page nine — auditory cortex development, annual recheck item. The conclusion line was printed: Myelination progressing normally, on the early side. After the words on the early side came a month range issued by the clinic. She drew a light pencil line under it, rubbed it out again with an eraser, and left a faint gray streak on the paper. The assessment date was five months back. She converted the month range. The result of the conversion was written down nowhere.
At six thirty she got home. She took the bus to fetch Zhou Shu from school, the four-thirty, with two bunches of kids in uniform aboard. Zhou Shu got on and picked the window seat in the third-to-last row, backpack hugged to her chest, not set on her lap. The bus jolted at the rail crossing. Zhou Shu's deskmate didn't board at this stop — the seat was her deskmate's by rights; they swapped every Wednesday. These were things Lin Wanzhao knew that Zhou Shu believed she didn't. Passing the printing plant, Zhou Shu spoke up suddenly: Mom, my deskmate cried a little in class today. Lin Wanzhao asked why. Zhou Shu said her little brother slipped past the window last year. The day before it happened, she said, he was still teaching her to fold paper boats; after, when she saw a paper boat, she asked what it was. Zhou Shu turned her face to the window as she finished. Lin Wanzhao's hand moved to a new place on the grab pole. After the printing plant came the post office, its shutter rolled halfway down.
Zhou Shu was already sitting at the table, homework half spread out, lunch box at her right hand. The box was an insulated steel one, about seven hundred grams full, and it had come home at that weight every day since second grade: the last few bites unfinished, brought back, washed by her own hand the next morning. Today the box was empty. Lin Wanzhao saw it while serving the rice and said nothing.
At dinner she asked: sampling class today. The seventh minute.
Zhou Shu, chewing: Mm.
She asked: you said a word.
Zhou Shu said: Mm.
She asked: what word.
Zhou Shu put down her chopsticks, thought for a while, and said, I can't say it. It's not that I forgot. It doesn't have a Chinese.
Lin Wanzhao's ladle of soup paused half a beat. She said, you mean you can't translate it.
Zhou Shu said, it's not that I can't translate it. When it came in, it never took the translating road. There she stopped, picked her chopsticks back up, and took a couple more bites of rice. Then she said, Mom, this can't be talked about in class. Talking counts as disrupting the sampling. It was my deskmate who raised her hand too late and got cut off by the one in front, that's the only reason they played it back.
Lin Wanzhao said, the teacher asked you about it.
Zhou Shu said, she asked. I said I was counting.
She asked: were you counting?
Zhou Shu said: about.
She didn't ask what about meant. Zhou Shu was eleven years and nine months old, and she had always talked like this: one sentence given, one sentence taken back, the rest kept for herself. Her kindergarten teacher had once written in a comment that the child retold things well and had ideas of her own, the second half of the sentence pressed flat under the first; at the parents' meeting the teacher herself couldn't have explained it. The soup was tomato and egg; Zhou Shu picked out all the tomatoes and left the egg. Lin Wanzhao slid the egg into her own bowl, and neither of them spoke while she did it.
After dinner Zhou Shu cleared the table. The division of labor had been set in second grade: she cleared, her mother washed. She stacked the bowls in three piles, laid the chopsticks in a neat row across the top, and before carrying them off she poured the last finger of soup from the pot into her own bowl and drank it standing. She did this every day; every day nobody saw it. Lin Wanzhao saw it, and having seen it enough times, it had become part of the dinner table.
After dinner Zhou Shu went to her room to do homework, the door left ajar. Lin Wanzhao brought in a peeled apple. The homework was math, word problems, the copied questions in a neater hand than the answers. One problem asked when two trains heading toward each other would meet; Zhou Shu drew two lines on her scratch paper and set three points on each, then put the pen down. Lin Wanzhao asked, you can't do it? Zhou Shu said, I can. I just don't want them to meet. She picked the pen up herself then, went on calculating, got four hours, wrote it, turned the page. She ate the apple halfway and left the other half upside down under the plate for tomorrow morning. In the living room Lin Wanzhao dialed Zhou Yu's number, and stopped at the eleventh digit. The custody agreement said major matters were to be reported within forty-eight hours; read literally, today didn't yet qualify. She set the phone face-down on the tea table and went to do the dishes. At the second bowl she understood why she had stopped at the eleventh digit: if she called, his first question would be the child or the workplace, and she didn't yet have an answer ready for either.
At ten forty she checked the home router, the TV box, the doorbell intercom, and switched off everything that could be switched. She had done this every day for seven years, since Zhou Shu turned four — the day she herself had transferred into the array station and seen, for the first time, on an oscilloscope, the underhum rise up from underneath a doorbell intercom's carrier wave. Switching off the equipment didn't block it; that was in the thirty-year-old conclusions too: it didn't parasite the devices but the signal itself, and people lived inside signals. She switched things off only to make the house quiet, and quiet was the one thing she was certain she could give. There were no electronic devices in Zhou Shu's room; the desk lamp was the kind with a manual switch — settled at renovation time, seven years ago. Zhou Shu believed the family had been poor for a stretch.
When the tidying was done she sat on the sofa a while and tried to recall the day she had first understood. She did this every few years, like a follow-up exam. The memory gave her the same few things it always gave: an enamel mug with tea stains on the rim; a stretch of hissing; the back of an adult woman, closing a window. Whether those had all been the same day she couldn't say; whether the woman was her mother she couldn't say either. At thirty she had looked it up on purpose — a good share of childhood memory is assembled afterward, and the one who assembles it is you, which makes your own testimony the least credible there is. She had accepted that conclusion calmly, and had been accepting it for fourteen years.
At ten fifty she called Old Song at the compound gate, in the tone of someone checking a water meter. No one had registered in, he said; cars from outside weren't his business. She said fine. He said, want me to go down and check the plate? She said no need, going to sleep. After hanging up she didn't sleep; she stood behind the curtain. The lamp in Old Song's duty room was yellow, lighting half the road. Across the street the fire hydrant stood empty, and under the streetlight a cat was moving slowly.
At five past eleven, a car came down below. On the clothesline hung Zhou Shu's uniform jackets, two of them, worn in rotation across a five-day week.
A white box van, local plates, with a square patch on its door a shade newer than the paint — a sticker had been there once, and been peeled off. It didn't drive into the compound; it stopped across the road beside the fire hydrant, engine off, and nobody got out. Lin Wanzhao saw it from the balcony while bringing in the washing. She hung the last piece, ran the drying rack all the way up, went back into the living room, put no lights on, and looked once more through the gap in the curtain. The car was still there.
Zhou Shu's door opened. The lamp in her room had a manual switch with poor contact — one press didn't always take; the light in the door gap died and came back, which meant she had pressed it a second time. She came out shuffling in her slippers, skipped the bathroom, walked straight to the living room window, stood, looked for a while, and said, Mom, there's a car downstairs.
Lin Wanzhao said, I saw it.
Zhou Shu said, it's faster than the letter.
Lin Wanzhao asked, what letter.
Zhou Shu said, Teacher Mu told me after class today, the official notice comes in writing and goes by secure courier, within one week. She said this in a borrowed tone, one word at a time, plainly Teacher Mu's own cadence, carried over whole. Then the cadence was set back down where it belonged, and she said, it won't take a week to get here.
Lin Wanzhao stood a little behind and to the side of her. She wanted to ask how do you know; what came out instead was: what time is it. Bed.
Zhou Shu went back to her room. Before the door closed she stopped at the threshold and said, back to the living room, no — with her back to it she said: sampling class is canceled tomorrow, self-study instead. Then the door closed.
Lin Wanzhao sat in the living room until half past twelve. The sound of pages turning had come from Zhou Shu's room from nine thirty until ten, slower and slower, then stopped. Downstairs the car changed shifts once, at twelve twenty; for those two minutes the doors stood open, the dome light on, two figures in the front seats in ordinary jackets, a thermos standing upright in the cup holder between them. At twelve twenty-two the doors shut and the light went out. She put a timestamp on all of it in her head — the same motion as timestamping data for the station — and caught herself doing it, and put the pen down. Where the pen went down was the glass desktop of the tea table, and under that glass, pressed flat, were six photographs of Zhou Shu from babyhood on, arranged by year, the one on top missing a corner.
It's faster than the letter. The Window Period Administration's written notice didn't reach the house until three days later, postmarked the day after the Watching Day, routed through the secure exchange — one day on the road, one day in sorting. The red seal at the bottom of the notice was intact. Count back from that postmark: on the day the car parked downstairs, the notice was still on the road, and the people in the car had already arrived.