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Your Universe of Digital Possibilities
Physarum polycephalum is a single cell the size of a dinner plate — no neurons, no brain, no central anything. Set oat flakes in a maze and it floods every corridor, then withdraws from the dead ends until only the shortest path between the food still glows. Lay the flakes out like the cities around Tokyo and, in a day, the slime retraces a rail map an engineer spent decades drawing — efficient, redundant, fault-tolerant. The computation isn’t in a mind. It is in the body: a million tiny agents, each following one local rule, and a chemical map that remembers where they’ve been.
Every agent reads the chemoattractant at three points ahead — left, centre, right — and rotates by the sensor angle α toward whichever is brightest, else holds course. No map, no goal: just follow the smell of where the swarm has already been.
The trail map T is the only shared memory: each agent drops a little d where it stands, the field blurs (K ∗) so neighbours can smell it, and a fraction ρ evaporates each step. Reinforcement plus evaporation is what lets unused paths fade and used ones thicken.
Tero’s distillation: a tube’s conductivity D grows with the flux Q it carries and decays otherwise. Heavily-used routes thicken, idle ones wither — a feedback that prunes a tangle down to an efficient, fault-tolerant network with nobody designing it.
The Mold is kin to The Flock (INST·31): the same lesson that local rules with no leader produce global order — there, alignment; here, a transport graph. It rhymes with The Dendrite (INST·54), where chance alone draws a branching network, except the slime’s branches are steered by a memory it deposits and erases. And it answers The Anneal (INST·34): a near-optimal layout found with no designer and no objective function — just deposition, diffusion, and decay, balancing exploration against commitment until the redundant veins starve and the efficient ones remain.