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Atzilus is Ila ViAlul from one Sefira to the next both in Oros and in Keilim.
מהתעבות האור נעשה הכלי
The two ideas associated with the thickening (more revealing, and in revelation more is always less [of the essence]) of the light:
1) Keli emerges.
2) The “keli within the Ohr” emerges and meets the Keli, rather than go away as is the nature of Ohr.
