In depth introduction into the premises of the Qubalah, the tree of life, and metaphysical progression through it's course and stages. Professional quality and clear for such a big topic that I have heard in other places not done this well. Qubalah can be seen as the origin for Masonic  magical rituals, Golden Dawn, OTO, and all other forms of western magic including Wicca and others that base the fundamental principles of their power from the Babylonian Tree of Life.