I think it is contested whether they are naturally occurring or man-made. What do you think?
If they are man-made, what purpose do they server? Decoration?
Decoration? Maybe. We've got plenty of wealthy people and government bureaucrats wasting money on public modern art master pieces. The archaeologists will need to identify likely quarry sites for the various stones for that first though. If they're finding these things near ancient structures, those could've been ball bearing components to construction machines used in construction of those ancient structures.
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