Huaqiangbei, before the floor wakes up

At nine in the morning Huaqiang North smells of solder flux and warm soy milk. The shutters along Zhenhua Road are halfway up, the metal still cool from the night, and the men who pull them roll their shoulders in the same rhythm a baker might. Outside the SEG Plaza entrance, a woman ladles congee into thin plastic bowls, drops a length of you-tiao across the rim, and hands it through a window of steam. We sit with her for a moment on a folding stool because she has been here since six and seems to know exactly which stall on which floor will open last.

SEG is the spine of the district. Thirty-some floors of vertical commerce stacked above the breakfast cart, each floor organised by a single category of component the way other buildings are organised by department. Resistors live on the second floor. Sensors on the fourth. Displays on the sixth, where the light is colder because thousands of small panels are already lit and idling. The lift is slow and crowded with trolleys, and nobody looks at their phone because the floor number, when it changes, is the only thing that matters.

We attend Mr Cheng's stall on the fourth floor, two metres wide, fluorescent overhead, a glass case of accelerometers and humidity modules arranged by part number rather than by brand. He sources for a Berlin hardware startup that makes air-quality monitors, and he has been doing it for nine years. The first email of the morning, he tells us, is always from Germany, and it usually contains a datasheet with three lines highlighted in yellow. He prints it, walks the floor, and by lunchtime he knows whether the part exists in quantity, whether a substitute will do, and what it will cost in lots of five thousand.

He calls this work fanyi, translation, though the word he uses for the act of finding a workable alternative is shanzhai. It used to translate roughly as bandit, a noun for copies, knock-offs, the famous fake Nokias of the late 2000s. Now we hear it spoken as a verb, meaning to rework, to fit a need, to draft a local answer to a foreign brief. The shift happened somewhere around 2014, he thinks. He cannot remember anyone announcing it.

On the table beside his is a folding card table where two men have laid out the modular phone they spent the night taking apart. Camera module here, vibration motor there, the screen propped against a cup of cold tea. They are not pirating anything. They are studying the bill of materials, looking for which components are commodity and which are bespoke, the way a tailor studies the inside of a jacket. One of them types numbers into a battered Casio and shows the other. The other shrugs, then nods.

“Shanzhai used to translate as bandit, a noun for copies. Now we hear it spoken as a verb, meaning to rework, to fit a need.”

A young engineer from Chengdu is here for the first time. She finished a six-week boot-camp in embedded systems in March and her teacher told her she had not really seen hardware until she had walked the SEG floors. She holds a printed list of part numbers in one hand and a paper map of the building in the other, and she keeps stopping to take photographs of the small handwritten signs taped to each stall, signs that name the stall owner's village in Chaozhou or Shantou as if to say where credit, or blame, should land.

There is an unspoken hierarchy on the floor that becomes visible if you stand still for ten minutes. The stalls nearest the lifts handle the smallest orders, often hobbyists and students. The stalls deeper in, harder to find without a guide, work with factories in Dongguan and Huizhou and quote in tens of thousands. The largest suppliers do not have stalls at all. They have an office two streets away, and a man in a polo shirt comes down to meet you in the corridor if your order is interesting enough.

We walk with Lin, an industrial designer based at OCT-LOFT, the converted factory district fifteen minutes south. She comes to Huaqiangbei once a week and treats it the way a chef treats a wet market. This morning she is iterating on the hinge of a desk lamp for a client in Hangzhou, and she has brought three printed renders and a small bag of last week's failed prototype. She wants to know if a particular stepper motor can be sourced in matte black housing, because the lacquered version reflects too sharply in the renders. Mr Cheng makes two calls. The answer arrives within an hour: yes, but only in lots of two hundred, and the colour-match needs a sample sent up from a coatings workshop in Bao'an.

The pace is the part outsiders find hard to describe. It is not frantic. It is patient and uninterrupted, like a long conversation among people who already know each other's positions. Decisions that would take a week of email in Berlin take twenty minutes here because everyone involved is standing within a hundred metres of each other and has been for a decade. Lin says she has stopped trying to explain it to clients. She just sends them photographs of the floor and the receipts.

By eleven the displays floor is fully lit and the corridors have the close, slightly electrical warmth of a room with too many small power supplies. The boot-camp engineer has filled two pages with sketches and is sitting on a low stool eating the second half of someone's you-tiao, listening to a stall owner explain why a particular ESP32 variant has been backordered since spring. She is not buying anything. She is, she tells us later, learning what questions sound like when they are asked properly.

What strikes us, walking back toward the metro, is how much of the work here is now original. Ten years ago a designer in Lin's position would have come to Huaqiangbei to copy. She comes now to draft. The components are the same components the rest of the world uses, but the assemblies she is sketching on her phone, between stalls, are her own. Mr Cheng says the proudest moment of his year was when the Berlin startup credited his stall, by name, in the acknowledgements of their certification documents. He keeps a photocopy in a drawer under the counter.

We leave around noon, when the morning's first negotiations are settling into lunch and the shutters on the lower floors are finally all the way up. The congee woman is packing her cart. The boot-camp engineer has agreed to meet Lin at OCT-LOFT next week to see what a finished prototype looks like in a studio. Somewhere on the sixth floor a man is testing a new batch of OLEDs, one panel at a time, his face washed in the soft cold light of each one as it comes alive.