The reason for 40,000 bowls and vases made of hard material such as granite and dolerite around 2800BC and found buried in chambers 33m beneath Djosers pyramid in Saqqara is an intriguing enquiry in itself. It appears that Djoser collected and treasured them for some reason, though they bore inscriptions to earlier royals.
It seems a pity that not more is done to investigate and discover the means, or the technology, with which these vases were made.