Excellent observation! I took piano lessons as a kid and played Clarinet in high school. I absolutely agree!I agree with OP. It's impossible to decipher if you cannot relate to it.
Also, if people were far more intelligent in the past and we were more connected to the earth and its frequencies then who is to say that people even spoke verbally or wrote things down? For what? Writing seems primitive compared to their achievements.
For example this image that KD posted: Where does one even begin regardless of how intelligent one is?
If this is suppose to be the "oldest language" then there is nothing to relate it to or base it on and how did it become so complex?
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If I had to try and decipher this, I would most likely end up in an asylum.
This could mean anything. My guess is musical notation.
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This is how I would base my assumption according to that which I can relate to:
*Every symbol has a triangle or engraved pyramid in it which means it could represent the numbers: 3 (base) or 4 (points) or 5 (surfaces).
*If it were music and was related to the alphabet then its a repetition of the notes C, D and E.
*The long line on the triangle could be the length/duration of the note
*The way the symbols are grouped and the succession thereof does in a way form scales
*If this was music then it is a highly complex piece