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'Seashells Get Their Strength from Interlocking 'Bricks'
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And they look good doing it, especially abalone nacre. I like materials science.
Here is <<
Biorock - Wikipedia, the free encyclopedia>>
I talked to this guy Wolf Hilbertz at a time when he was being 'negotiated' against by the concrete industry. Wikipedia kind of papers over why he fled to Germany, but it's now 'cathodic protection' for failing concrete structures, essentially gluing them back together:
Applicability of Electrodeposition as a Repairing Method for Deteriorated Marine Concrete Structures
Mr Hilbertz was thinking more in terms of a 3D printer head on an arm that would would extrude or eat building members as necessary. I've still got the original paper he did somewhere. His method reportedly would fill a simple wooden mold, similar to the claim by Modumetal.
Also Hilbetz had to pulse his DC bias negative occasionally to drive off hydrogen bubbles. These guys may have just found a means of modulating AC to find the sweet spot. Or, I suppose, not...