I like Cymatics-images.
Quote:
"Cymatics (from Greek: κῦμα "wave") is the study of visible sound co vibration, a subset of modal phenomena. Typically the surface of a plate, diaphragm, or membrane is vibrated, and regions of maximum and minimum displacement are made visible in a thin coating of particles, paste, or liquid. Different patterns emerge in the excitatory medium depending on the geometry of the plate and the driving frequency
These are by Alexander Lauterwasser (soundvibration in water):
These are by Hans Jenny (soundvibration in sand):
(Picture of tortoise beside cymatic sound pictures at 1021 Hz, 2041 Hz, 1088 Hz and 1085 Hz.)
In Jenny's books there are many more examples of how a certain Hz-vibration forms patterns which can be seen in flowers and animal furs, it's like every shape possible has a certain Hz-vibration.
In Lauterwasser's book (cymatics with water) one can see even letters forming, different alphabets, like letters did already exist in any language, before written letters themselves existed.
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English is not my native language, so I will very likely do mistakes in writing or understanding. My edits are due to corrections of mistakes, which I sometimes recognize just after submitting a text.