The number 7 differentiates many sequences,for example,the body and hand shows seven divisions,the week is divided into7 days,the 7 step musical scale,
the progression of human physical and spiritual development-in all living forms
the presence of 7 segments-show the octave(7 steps plus one thatboth ends
one cycle,and begins the next)is a universal phenomenon,The law of harmonics.
Everthing is composed of vibrations of various frequencies,when the frequencies
are "harmonized" the organism which is based on the same 7 step sequence
experiences a state of "well being".