The tree opens like a night sky.
I'm on my break, wedged between the stockroom shelves with a cheese roll in one hand, when I finally think the words TECH TREE at the panel and the flat little status box unfolds, and unfolds, and keeps unfolding, until I'm standing in the middle of something far too big to call an interface.
Imagine every star chart you've ever seen. Now imagine the stars are ideas — more of them than a person could read in ten lifetimes — all joined by threads of light, star to star, cluster to cluster, everything hanging from three great trunks labelled in the System's calm capitals:
PHYSICS. ENGINEERING. SOCIETY.
And at the very top, above all of it, one header: TYPE 0.
"Oh," I say, out loud, to a shelf of tinned tomatoes. "Oh, that's the stage of the whole species."
I drift towards the PHYSICS trunk — drift is the right word; the tree moves by attention, leaning wherever I look, no buttons anywhere — and the clusters sharpen into names. Mechanics. Thermodynamics. Electromagnetism. Semiconductor Physics. Every one of them glows the same soft, even grey, and every one carries the same patient label:
AVAILABLE — INTEGRATION REQUIRED.
Everything humanity has ever worked out, mapped. Fire is in here somewhere. So is the jet engine. So is whatever branch of materials science makes crisp packets crinkle. All of it is grey. All of it, apparently, on offer.
"Leon!" Boss Steve's head appears around the stockroom door with the timing of a man who can smell wages being wasted. "You're staring at the beans like they owe you money. Aisle Four."
"On it, boss."
I mop Aisle Four with my body while my head stays in the sky.
The shift and the discovery share the afternoon between them. That's the strangest part: all of human knowledge turns out to fit neatly into the gaps between customers. I scan a meal deal — *Beep — and spend the pause before the next basket following the ENGINEERING trunk, watching Materials split into Metallurgy and then into a hundred grandly named sub-fields. I count out change, then poke at SOCIETY, expecting it to be the small trunk, the soft one — and find it enormous. Medicine. Economics. Agriculture. Law. Governance. Statecraft. An entire constellation just for the machinery of running civilisations, bigger than some of the science branches. Something about that sits oddly in my chest. I can't say why yet, so I leave it sitting.
Amy passes the counter mid-afternoon with a box of stock and gives me a look. "You're miles away today."
"Light-years," I say, honestly, and she snorts and moves on, and I go back to the sky.
The real test comes at half four, when I try to open a node. [COMPUTER SCIENCE — FOUNDATIONS] — my own degree, sitting up there in the same patient grey as everything else. I reach for it half-expecting the film version: the download, the flood, kung fu arriving in my skull between customers.
What I get instead is a syllabus.
The node opens into a structure — my whole field laid out as a map, every concept placed, every dependency drawn, with self-tests hanging off it like rungs on a ladder. And one understanding arrives with it, wordless and absolute: the System will hold the ladder. It will not climb it for me. The reading is mine to do.
"You're joking," I mutter. "You're a magic space brain, and your big offer is homework?"
— INTEGRATION IS UNDERSTANDING, HOST. UNDERSTANDING IS NOT ISSUED. IT IS BUILT. —
"...Fine. Flashcards it is."
---
After the shop closes — back to the flat, tea, curtains shut on a Saturday night I have no plans for — the tree fills the room, and I go looking for its edges.
They're closer than you'd think. Past the frontier of every branch, beyond the last grey stars, there's fog. Not darkness — darkness would be obvious: nothing to see. This is a soft, deliberate blur, like a hand held over the rest of the page, and no amount of staring pulls the viewer any deeper into it.
"What's out there?"
— BEYOND THE FRONTIER: TECHNOLOGIES HUMANITY HAS NOT REACHED. —
"Show me."
— YOU NEED TO REACH THEM. —
And then, because apparently even cosmic systems enjoy explaining the rules, it lays the whole game out — sparse, clean, one line at a time — while I sit on my bed with cooling tea and a heart going like a drum.
The grey nodes are humanity's. Integrating one costs nothing but genuine study, and each one completed pulls that branch's frontier a little further into view. The nodes past the frontier — the ones in the fog — belong to nobody. Not invented yet. Not written in any book, any paper, any server on Earth. Those cost TP.
And paying for one—
— UNDERSTANDING IS CONVEYED ON UNLOCK. IMMEDIATELY. COMPLETELY. —
I sit very still.
"Immediately," I repeat. "As in — no ladder. No flashcards. I'd just... know it. A science that doesn't exist."
— YES. —
A pause. The pause feels different from its other pauses. Eager, almost.
— IMPLEMENTATION IS THE HOST'S PROBLEM. —
There it is. The whole shape of how this thing works, and it's both bigger and smaller than any novel version. No downloaded kung fu. No instant godhood. A library holding every book ever written, free, if I do the reading — and past the last shelf, books nobody has written yet, priced in a currency I earn by reading. Study to earn. Earn to know. Know things no one else on Earth knows.
Then build them. With these two hands, and a CV that says "minimart".
I laugh, and it comes out slightly unhinged, so I finish the cold tea and take myself to bed. When I close my eyes, the grey stars are still faintly there, printed on the inside of my eyelids.
---
Sunday, I walk.
No shift, no plan, just Croydon on a grey September morning — and the tree comes too, because it lives where I live now. Walking an ordinary high street with the map of all human knowledge idling at the edge of your vision does something to you.
The bus that hisses past: Mechanical Engineering, Materials, Combustion — a hundred grey stars cooperating at thirty miles an hour. The pharmacy on the corner: a whole wing of the Medicine branch, shrunk onto shelves, from paracetamol to the prescriptions behind the counter. The phone in every hand on this street — I can trace those branch-lines nearly with my eyes shut, silicon to signal processing to whatever the fog is hiding past the network nodes. Nobody's looking up. Why would they? You can't see a civilisation from inside it, any more than you can see the whole supermarket from the middle of Aisle Four.
Nought-point-seven-three. I keep tasting the number as I walk. All of this — every bus and pill and phone, every star on three grey trunks — and on the only scale that apparently matters, we've barely got through the door.
Somewhere past the retail park, the dizziness of that turns into something I can actually hold. Because I know this feeling from work. It's the feeling of a massive delivery landing all at once, forty cages deep, and there is only one way through it that has ever been invented: one aisle at a time. Start where you're strongest. Clear it properly. Then the next.
I buy a meal deal I can't really justify, sit on a wall, and do what four years behind a counter have actually trained me for: I take stock.
One degree, three years stale — and about to matter again. A brain the sky has apparently renovated. Two working hands. Seventeen hundred quid of savings, built fifty pence at a time. A work ethic that has survived four years of Steve's minimart.
So the plan is the same one that clears a delivery: start where I'm strongest. Computer Science — my branch. Integrate the foundations, drag that frontier into the light, and find out what the fog is hiding on the far side of the one field where I already know the ground.
That evening, back at the flat, washing finally dry and curtains drawn, I stand in the middle of the sky one more time.
"Alright," I tell the tree, and my voice has stopped wobbling somewhere along the way. "Computer Science. Let's un-waste a degree."
I reach for [COMPUTER SCIENCE — FOUNDATIONS] and select it — properly this time, meaning it.
— INTEGRATION QUEUED. —
— COMMENCE: MONDAY. REST, HOST. —
"...Did you just give me a bedtime?"
— IT IS SUNDAY NIGHT, HOST. THE ARITHMETIC IS NOT COMPLICATED. —
I open my mouth to argue. Then I close it, because it's Sunday night, I've had the kind of weekend that starts with a meteor to the face, the library opens at half eight, there's an evening shift behind that — and the insufferable truth is that the magic space brain is right. A knackered Host is no use to a civilisation-scale tech tree.
I hate that it's right.
I brush my teeth, glaring at a glowing rectangle only I can see. It says nothing, and yet somehow says it smugly.