Nikola Tesla was able to find that there are repeating patterns of 3,6 and 9 in every number when we add up. He also was able to find interesting geometric patterns also in relation to 3,6 and 9. Thus he had an intuitive doubt that is that just a co-incidence or is it the basis of the creation in nature. As I had already mentioned in my website here that 3,6 and 9 have connection with the fundamentals of sub-atomic, elemental and matter levels of realms or reality. I would say that 3 is acting as basic here. It is because the basis of creation and its flourishment is from energy, force and mass trio. And this unfolds the 3 D world. 6 and 9 are coming into this equation as the Value Added Derivatives which makes the elemental or atomic and the Matter states possible. I am sure this is the reason why Mr. Nikola Tesla was able to find connections in various geometrical pattern and similar synchronizing patterns in various physical forms of reality in 3D.