Any light that expands from Him instantly consists of two discernments: The first discernment is the expanding light itself, before the form of “desire to enjoy” appears in it. The second discernment is after the form of “desire to enjoy” appears in it, at which time it becomes coarser and somewhat darker due to the acquisition of disparity of form (Baal HaSulam, The Study of the Ten Sefirot, Part 1, “Inner Observation,” Chapter 6, Item 24).

Aviut is what distinguishes the creation from the Creator. Creation feels its difference from the Creator; this quality is called Aviut, that is, something that obscures the light of the Creator and feels the difference from Him.

In our world, this is manifested as the coarseness of desire. There are desires that are coarser or purer. The gradation of these desires is called Aviut.
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From KabTV’s “The Study of the Ten Sefirot (TES)” 1/1/23

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