Oh, thanks very much! Very thorough and thoughtful
No, the questions is more fundamental: is there anything in the inorganic universe that has the ARCHITECTURAL properties of a blood vessel (not bio-structure-physiologic)... just a precise circular tube, open on both ends. Nothing to do with flow... just structure.
Yes: have posed the same question to materials scientists, geologists, NASA, and even the patrons at Wlilhoites' Biker Bar (before getting tossed out).
Not closer to an answer yet. Hopefully there's time....
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