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originally posted by: BigBrotherDarkness
a reply to: Harte
I read in an Eypgtian magic book decades ago it was with large tuning forks... not only to fracture but to vibrate the sand to move the blocks.
originally posted by: BigBrotherDarknessI cannot verify such... although frequency of a voice can shatter glass from a distance,
originally posted by: BigBrotherDarkness and resonance makes specific patterns of sand above a speaker depending on frequency.