You'd think sourcing mattered, but clay was ubiquitous. The material may have been subsidized, here I think of Gilgamesh's Uruk, said to have been part city, part orchard, and part clay pit.
It was the labor that was profitable, with employment occurring via ad hoc hiring or regular corvée duties.
It was the labor that was profitable, with employment occurring via ad hoc hiring or regular corvée duties.
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So, it may be surprising that it doesn't seem industrialized on the same level as, e.g., wood in other parts of the world. It's a bit unclear.
This tracks for premodern societies, where human labor is fundamentally the most lucrative commodity.
There are several industries that are largely invisible due to this bias, with clay and reed being the most apparent examples.
It was human time and effort that mattered.