The story is a confession written by a Chinese spy in the hour before his execution. Yu Tsun, working for the Germans in WWI Britain, must convey one critical word — the location of a British artillery position called Albert — by murdering a stranger of that name so the news appears in the next day's paper. On the way to the murder, he visits the sinologist Stephen Albert and learns, in a final hour of grace, that his own ancestor Ts'ui Pen had once retreated for thirteen years to write "an infinite book" and build "a labyrinth in which all men would lose themselves." His family found only a chaotic manuscript and no maze. Albert had solved the riddle: the book was the labyrinth — a story in which every choice is taken, every fork followed, every possible future rendered simultaneously real.
The shape Ts'ui Pen drew is the shape every modern algorithm uses to reason about possibility. A directed acyclic graph: nodes are moments, edges are decisions, and the structure fans outward through time without ever returning to itself. The number of leaves grows as bd — branching factor to the depth — until the universe runs out of memory. Every Git commit history, every dependency tree, every Bayesian network, every possible-worlds semantics for modal logic descends from this same skeleton. Borges drew it as fiction. Computer science drew it later as a data structure. Both are saying the same thing: existence is not a line but a tree, and we are passengers along one of its infinite branches.
Sixteen years before Hugh Everett's 1957 dissertation introduced the many-worlds interpretation of quantum mechanics, Borges had described its metaphysics in narrative form. In the Everettian universe, the wavefunction never collapses: every quantum measurement spawns every possible outcome; each branch is real; no branch is privileged. The cat is alive in one world, dead in another, both simultaneously — and you are the version of the observer who happened to look in this one. Ts'ui Pen, a Chinese governor in the seventeenth century who never heard the word "quantum," had already drawn the diagram. The garden is the multiverse. The novel is the wavefunction.
The graph above is alive. Nodes pulse in brass; new branches sprout when you click; type a decision into the oracle and a path will fork from a moment that, until now, did not exist. There is a strange consolation in this geometry. The graph here is incomplete — we render only what fits in the viewport, only what has been chosen — but the totality it gestures toward is not. Somewhere in the unrenderable interior, every choice you regret was never made. Every door you closed is open. Every word you should have said was said. Borges called the garden incomplete, but not false. The graph is incomplete because the screen has edges. It is not false because, on the other side of a missed quantum coin-flip, another reader is also reading this sentence — and breathing easier.