Sound you say?
Rabbithole - > https://www.mentalfloss.com/article/16273/600-year-old-music-found-encoded-chapel-walls
I think they touched on this in Dan Browns DaVinci Code, I think. Really neat theory though - and it would make sense, seeing how music was a HUGE influence throughout history, even oral traditions being passed via song and dance. To encode things in symbols that can be interpreted and have very little data loss (read: misinterpretation), is simply amazing.
We are way smarter than we think. Which reminds me:
We either believe that our ancestors are stupid, backwards, savage idiots.. Or we believe what our ancestors said about jews.
ETA: What if 2-D cymatic patterns could somehow affect a particular, unknown energy field and affect differently?
(post is archived)