>On a shameless tangent, note that some "dry stone" building techniques
>are actually _hideously_ sophisticated, using it in its most general
>sense of "mortarless". The extreme examples of this are the central
>american culturs (I think perhaps the Toltecs, don't quote me on this)
>who managed to build dry-jointed structures with _huge_ stones, so
>exactly that one can't get a razorblade between two adjacent blocks.
Perhaps they used concrete?
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