"The Elephantine Granite Monolith"
https://youtube.com/shorts/1Fn3oVkUlQo?feature=share

_Really_ funny listening to this guy imply that the granite is cut too precisely and too flat to have been done by hand by the Egyptians.

Every decent machinist knows that the root of mechanical accuracy is the granite surface plate. Which famously you can make by hand with absolutely no tools via the three surface method. Takes a lot of time. But conceptually it's really simple.