When I visited Ravenna, I saw some amazing Roman-era mosaics, including an uncensored Christ undergoing baptism. The detail was absolutely spectacular. Just a

When I visited Ravenna, I saw some amazing Roman-era mosaics, including an uncensored Christ undergoing baptism. The detail was absolutely spectacular. Just a few blocks away was a medieval church built hundreds of years later. The mosaics there looked so amateurish that they looked like they were done by children. Japan has somewhat of an answer to this: every 20 years they tear down the Ise Grand Shrine and build it up again. This allows them to retain specialized construction techniques across generations. https://en.m.wikipedia.org/wiki/Ise_Grand_Shrine https://en.m.wikipedia.org/wiki/Ise_Grand_Shrine