What is Reddit's opinion of Cymatics: A Study of Wave Phenomena & Vibration?

From 3.5 billion Reddit comments

There was more research. One picture resembles a human eye.

Cymatics: A Study of Wave Phenomena & Vibration

https://www.amazon.com/Cymatics-Study-Wave-Phenomena-Vibration/dp/1888138076/ref=mp_s_a_1_1?crid=1Q7Q6DJWC07D2&keywords=hans+jenny+cymatics&qid=1650157823&sprefix=hans+jenn%2Caps%2C85&sr=8-1#

When I bought this book, it was only around $60.

http://math.berkeley.edu/~kwray/papers/string_theory.pdf

http://www.amazon.com/Cymatics-Study-Wave-Phenomena-Vibration/dp/1888138076/ref=aag_m_pw_dp?ie=UTF8&m=AXBL2UFS2IZNA