any practical applications of this ever been documented?
A Couple Of People Cymatics has before documented starting with a benedictine monk Guido D’Arezzo, extending to Dr. Joseph Puleo, some say Nikola Tesla spoke of this with the following quote "If you only knew the magnificence of the 3, 6, 9 then you would hold the key to the universe.”
3,6,9 are FNG (family number groups)
below is a book with further documentation
http://www.amazon.com/gp/product/09...mp=1789&creative=9325&creativeASIN=0923550399
Cymatics. There's a Fellow By The name Of Marko Rodin That Teaches What Is Called Vortex Based Mathematics- it basically covers:
Cymatics
Sacred Geometry
Ennegrams
Fractals Math (an example of fractall math would be eg. taking the number say 167. 167 would be a triplet (compose of 3 numbers 1-6-7, you add these totaling 14 from fourteen you get five. NOw the number 5 would be in the second FNG)