Followup question: was glass made on an "industrial" scale (by Roman standards, like some other goods which were traded in quantity by cart or by sea) or was it produced locally, as needed?

I'm having a hard time imagining ancient Romans transporting sheets of fragile glass across long distances by cart, but there also isn't any sand in some places, and it seems equally challenging to transport large quantities of sand by cart. Impractical, even.

Hey there,

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