The Law of Root and Branch
Kabbalists have found that the form of the four worlds, named Atzilut, Beria, Yetzira, and Assiya, beginning with the first, highest world, called Atzilut, and ending in this corporeal, tangible world called Assiya, is exactly the same in every item and event. This means that everything that eventuates and occurs in the first [highest] world is found unchanged in the next world, below it, too. It is likewise in all the worlds that follow it, down to this tangible world.
There is no difference between them, but only a different degree [quality of desire], perceived in the substance of the elements of reality in each world.
– Baal HaSulam, “The Essence of the Wisdom of Kabbalah”
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