M mdgnys New member Aug 21, 2010 #1 When they placed sand on a piece of metal and played oscillating sound into it, it matched those symbols at different Hz. Could you tell me where this was found, ant maybe the video containing it?
When they placed sand on a piece of metal and played oscillating sound into it, it matched those symbols at different Hz. Could you tell me where this was found, ant maybe the video containing it?
