There was a Swiss scientist, Dr. Hans Jenny (1904-1972) who built a device which allowed audio signals to animate matter and then record the results. The purpose was to study wave phenomena, which Jenny called "cymatics." Thus, above is Jenny's photograph of the vowel 'A' in sand. In other words, if you sort of beam the vowel 'A' at sand, the waveforms leave this result, which is very like a yantra. Now yantra is always considered the visible form of mantra, and this sort of photograph seems to be a kind of proof that the ancients knew what they were doing. I would like to see the results for OM AH HUM, so if anybody knows how to do this please let me know.