[SoCal Pubbie]

This is a long read, and I did not go through all of it myself, but this guys suggests they used ultrasonic machining:

http://www.theglobaleducationproject.org/egypt/articles/cdunn-1.php

[Openurmind]

Being a musician and Tesla frequency kind of guy, I absolutely think this is very possible. In fact sonic 3D printing is an up coming new science. This topic of sonic frequencies deserves a website of it’s own. Everything is SOUND. lol