...and it is devoid of the light of Eyn Sof, blessed be He, in the sense that His limitlessness is not found there as at first. This explains why the worlds can exist on this level in the hollow of which we are speaking, because the Unlimited – which would otherwise not permit the existence of separate levels – is not found there after the Tzimtzum.
The way this appears in the prophetic vision is as a hollow, vacated space, filled with a fine light that we call the Residue. This is the “place” in which all the created worlds will stand, as I have explained.