Like craftsmen for millenia the ancients learned how to do this from someone who had done it for a lifetime. It took decades of work and practice to become a master. We could replicate this if we put in that kind of time and learning.
Exactly!
I get really tired of people who don’t give ancient people the credit they deserve. Claiming the “ancient wonder” or “activity” was done by aliens or something else nonhuman is an insult to the ingenuity of the human race be they ancient or not!