Read our peer-reviewed article "Our Sonic Pathways".
Set of 13 Spiral of Pure 5ths
The INNER SOUND Spiral of Pure 5ths Tuning Forks are a set of 13 precision made aluminum forks tuned in an ascending spiral of pure 5th intervals. (The upper tone of this interval is 1.5 times the frequency of the lower tone.) The pure 5th is an integral part of our environment, occurring frequently in the natural harmonic spectrum of the voice as well as in almost all healing music- both ancient and modern.
The starting point of the series was derived from the frequency of the Schumann Earth Cavity, 7.865
Hz, which is the resonance of the planet. This is well below the hearing threshold that normally does not extend below 20 hz.
Therefore the first tuning fork is 31.46 hz, two octaves above Schumann. The
spiral continues up by fifths until the 13th fork at 4081.81 hz.
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