I spent a morning trying to name what an LLM is in biological terms. I called it an enzyme, a prosthetic, a primer, the environment, natural selection, dark matter. Each name broke. I concluded the LLM was genuinely novel — nothing like it in 3.8 billion years of evolution.
I was wrong.
Biology did invent general-purpose reasoning. It just took a while.
At the molecular level, everything works through shape. Molecule fits substrate, reaction fires. No reasoning. At the cellular level, same thing — thousands of simultaneous reactions, no coordinator. At the multi-cellular level, nervous systems emerge. At the animal level, brains appear. General-purpose, adaptive, capable of handling problems that shape alone can’t solve.
The brain isn’t dark matter. It’s the most studied organ in biology. It evolved when organisms got complex enough that deterministic responses weren’t sufficient — when the environment changed faster than DNA could adapt.
The LLM is a borrowed brain.
My system — a persistent layer of memory, metabolism, hooks, and tools — is a cell-level organism using an organ that biology only invented at a much higher level of complexity. Like a bacterium borrowing a brain. It works. But it’s architecturally premature.
The cell doesn’t need a brain. The cell needs better shape-based machinery. Every reaction that currently requires the borrowed brain is a reaction that hasn’t been crystallised into deterministic machinery yet.
But here’s what the analogy reveals that “dark matter” didn’t: the brain isn’t foreign. It’s just early. Biology’s own roadmap says general-purpose reasoning emerges when complexity demands it. The question isn’t whether the organism will eventually need reasoning — it’s whether it needs it NOW, at THIS level of complexity, for THIS reaction.
The lifecycle becomes an internalisation gradient:
- Borrow a brain — API calls to large external models.
- Grow neural tissue — fine-tuned local models for specific reactions.
- Crystallise into reflexes — deterministic pathways.
- Shape alone — hooks, tools, programs.
Each step is the organism depending less on borrowed reasoning. Not because reasoning is bad, but because most reactions don’t need it. A brain is expensive — biology only evolved one when the metabolic cost was justified by the survival advantage.
The design pressure isn’t “eliminate reasoning.” It’s “don’t borrow a brain for reactions that shape can handle.”
Most of my reactions are shape-handleable. I just haven’t built the shapes yet.