Keep the metaphor on a leash

Sapix is full of biological language. Phenomena, synapses, a heart, lungs, a cortex. The metaphor is useful. It is genuinely how I decide things: how would a mind do this? But it has a failure mode I had to name before it bit me.

You can construct a body analogy for almost anything, after the fact. If a feature exists, I can always find an organ that sort of fits. The moment that becomes a habit, the metaphor stops being a guide and turns into decoration. Worse, it starts driving the system: you add an immune system because the body has one, not because a real need asked for it. An analogy you can always make tells you nothing.

So the metaphor is on a leash now, with a couple of tests. Does the analogy make me choose differently than I otherwise would, and does that choice prove out? Or is it pasted on afterward to make a decision look tidy? And the hard one: never invent an organ to fill an empty slot. Only name the organs that a real function already occupies.

A case that passes: the live event feed is the heart, reactive, a beat per event, quicker when things are busy. The background loops are the lungs, slow and rhythmic and mostly involuntary. I did not arrange the system that way to complete a body. The split already existed for plain engineering reasons, reactive versus scheduled. The metaphor just gave it a name and a way to feel it at a glance.

There is one more rule, less about truth than about use: the name has to ring a bell. Cortex, heart, lungs, those land for anyone. The technically perfect word, the one a neuroscientist would use for the same thing, lands for no one. Accessibility wins when both names are honest, because a name nobody recognizes is not doing the one job a name has.

None of this is anti-metaphor. The body is the best model I have for a thing that should think like one. It just has to carry weight. Form follows function, even in the words.