Notes · Observation
On rivers, lymph, and the fear of being wrong
After last week's note I got 39 emails. Most said: this is obvious. A few said: this is dangerous. One thanked, didn't say anything. All were right. The one who thanked knew there is no wrong or right...
The emails that said this is obvious were sent by people who had already been thinking something like it. The emails that said this is dangerous were sent by people who understood what happens when an analogy outruns the evidence.
Both groups are right. The analogy between drainage basins and lymphatic networks is obvious once you've seen it, and dangerous precisely because of that obviousness — because the mind slides too easily from "these look similar" to "these are the same thing" to "therefore this mechanism must operate here."
The mechanism question is the one I care about. Not whether rivers and lymph resemble each other — they do, visibly — but whether the resemblance is evidence of a shared underlying rule, or just the kind of convergence that happens when you have fluid moving through branching channels under gravity or pressure.
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