The way in which this appears in the prophetic vision is that Eyn Sof, blessed be He, contracts Himself in one place, leaving a place void of Him. This expresses how the work of creation is revealed with the aspect of limitlessness removed.
Part 3:...and adopted a path of limited action. This is called the Tzimztum (contraction) of Eyn Sof, blessed be He. This indicates that the Tzimtzum is not only a matter of the absence of limitlessness. The Tzimtzum itself sustains the realm of boundaries and limitations in being. The Tzimtzum causes the disappearance of limitlessness, maintaining the boundaries and limits in being. In the realm of limits and boundaries thereby revealed lie the roots of Din, Judgment.