The Tree of Life is an ancient Hebrew diagram that maps the cosmos as well as the human psyche. Most esoteric scholars who study this system are unaware that it is also a map of the overtone series and of musical intervals. Every Hebrew letter represents a whole number ratio which is also a musical interval. This is a logical and rational system for classifying the fundamentals of musical acoustics as well as a mystical map of the subtle planes of the universe. In most ancient alphabets each letter represents a number.
In fact there aren't separate numbers and letters, only letter-numbers. This means that each word is a sum total of letter-numbers. This offers a way of understanding what each word means and what elements make it up. In English words do not have exact relationships with other words. With Hebrew (or Greek for that matter) each word has a very specific relationship with every other word.
Some words have the same total numeric value and are considered to be different aspects of the same energy. This study is called Gematria. Each word has it's place in a mathematical continuum. This type of esoteric study associated musical theory with astrology, geometry, cosmology and qualitative mathematics. Music bound the other esoteric sciences together into a coherent whole. Music has long since been disassociated from these other sciences to the detriment of them all. Musicians today aren't taught that musical harmony is also a system for mapping the innermost reaches of the human mind and for organizing abstract thought processes. The laws of harmony and acoustics are also the laws of vibrational interaction on every plane of experience. I've hardly begun on this subject and could fill many more pages were I to allow myself. Most musicians will not have the patience to delve deeply into this dry and esoteric subject and most esoteric scholars will not have the musical understanding to grasp the tonal significance of it as well.
Click on the graphics for a larger view of the diagrams.
Interactive Tree of Life
QBL as a spiritual path
Tree of Life article
Letter as hand gestures
Role of the hand in evolution of language