You Can Just Build Things

Over the past week a few things snapped together in my head like magnets. A DeepMind documentary called The Thinking Game. A Marques Brownlee video that makes the scale of Apple’s M5 chip feel bodily real. Dr. STONE, which rebuilds civilization from nothing. And Orb: On the Movements of the Earth, about what people will risk to carry an idea past their own death.

They should not fit together. One goes inside a chip, one inside an AI laboratory, one begins after the end of the world, and one looks up at a fifteenth-century sky.

They landed on the same feeling anyway. Almost everything good around me is held up by a stack beneath it and a chain behind it.

The stack is what had to exist first: materials, tools, measurements, skills, institutions, agreements, and people doing hard work carefully. The chain is what had to survive long enough to reach me. Observations, diagrams, failed experiments, corrections, teachers, copies, courage.

Take the stack and the chain seriously and inheritance turns into a responsibility, and then, oddly, into a relief.

There is a slogan builders pass around: you can just build things. One honest look at a phone and the slogan collapses. Nothing was ever just built. It holds anyway, for one reason. The world was built. So you can build.

Start with the phone on the desk in front of you. The chip inside it was made on what the industry calls a 3-nanometer process.¹ My brain can say that. My brain cannot feel it.

So I steal a trick from Marques Brownlee and scale the thing until my intuition has something to grab.

Shrink to the height of a keyboard key and a laptop is a skyline. Keep going, down past the width of a red blood cell, and a hair is a cliff, a raindrop is a lake, and light waves run about as long as you are tall. At the bottom of the ladder sits the transistor. If one were the size of a Toyota Prius, the phone holding 19 billion of them would be about the size of Earth.

Now watch one get made. Chips are printed, hundreds at a time, onto a wafer: a mirror-smooth disc of silicon about the width of a dinner plate, sliced from a single grown crystal. The patterns go on in layers, and at the end the wafer is cut apart into individual chips.

The printing is done by lithography machines, and the ones that handle the hardest layers come from a single company. ASML, in the Netherlands, is the only commercial supplier of extreme ultraviolet lithography systems. An EUV machine costs hundreds of millions of dollars. The newest High-NA generation runs to about $380 million and weighs as much as a hundred cars. The first installation took 250 engineers about six months.²

One company. On the whole planet. For the hardest layers in the most advanced chips, the road runs through a machine that leaves a warehouse in the Netherlands in 250 boxes.

Design to mass production takes hundreds of steps and up to four months, with as many as a hundred layers, each aligned to the others at nanometer precision.³

The machine makes its light by dropping molten tin. It shoots the falling droplet with a laser twice, once to flatten it, once to vaporise it. The tin becomes a plasma, and the plasma throws off extreme ultraviolet light at a wavelength of 13.5 nanometers. It does this up to 50,000 times a second. Glass would swallow light like that, so the whole optical path is mirrors, in a vacuum. Underneath it all, a stage holds the wafer in place to within a quarter of a nanometer, correcting itself 20,000 times a second while the exposure is happening.⁴

Somebody built that. On purpose. And then they built more of them.

None of that is a laboratory demonstration. It runs on a production line, every day.

A chip is a treaty between strangers. Almost nobody who uses one could build one, almost nobody who helped build it understands every layer, and the layers meet anyway.

In 1965 Gordon Moore had about five points on a graph. They showed the number of components on a chip roughly doubling every year, so he drew the line ten years forward and predicted that by 1975 you would fit 65,000 of them on a single chip. From five dots. He was right, and in 1975 he moved the rate to every two years, and the industry took a man’s guess and made a metronome out of it, and then a promise modernity made to itself: the impossible would arrive on schedule.⁵

Sixty years later, here is what the schedule delivered. The first general-purpose electronic computers ran on vacuum tubes and filled rooms. ENIAC used about 18,000 of them.⁶ Apple’s A17 Pro holds 19 billion transistors.⁷ Nineteen billion. In something you leave face down on a table.

The tolerances. The standards. The night shifts. The prototypes that failed and the people who came back the next morning anyway. We inherit the finished verbs:call, render, search, translate, and forget the thousands of nouns underneath.

When the seams disappear, gratitude goes with them, and so does agency. The world starts to feel like a set of sealed products delivered by forces beyond you.

The world isn’t sealed.