I've been in the alt-sci world of late and came across this statement as part of research that the pyramid of giza was a piezoelectric crystal hit with an acoustic wave hit by an aquatic ram pump. I can make a thread on that if you feel shizo enough, but this to me bears a separate thread.

I'm sure you, the smartest board on 4chan, are familiar with $Cymatics$
https://www.youtube.com/watch?v=wvJAgrUBF4w&t=5s&ab_channel=brusspup

I add this second source here
https://www.youtube.com/watch?v=stMCW6L5GXA&t=24s&ab_channel=soundhealingresource
as it directly pertains to the human voice.

Now, the statement that I've read, in pic related, (page 30) of
http://lunahelia.com/resources/soundresearch.pdf
claims they built their letters doing this. I would like to confirm this experiment myself, any cymatics experts know of how to get these tonal scopes, or have an idea how to reproduce this? As is common in Alt-sci land, attestions are plenty, but experiment is adrift.

Thanks