WVK Wrote:
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> Could irregular shaped stons been used for structural reasons, more stable then identical
> blocks? If so could they be man made?

Technically, walls made from different sized blocks are better protected against earthquakes. But if the original builders were aware of that, we don't know. The main point of the large irregular blocks is, that they have been poured in place and not transported with their final large mass. And as they automatically adjust by that to the neighboring blocks you don't need to try to achieve the same size of all. My guess is that the earthquake protection is a nice side effect which may have been observed later by the builders, but as they anyway used the method already, that discovery was most likely irrelevant for them.