This Tree of which we are speaking is the Tree of the four letters of HaVaYaH, blessed be He, which includes everything from the beginning of Adam Kadmon to the end of Asiyah in all the different aspects discussed in Kabbalistic literature. Standing around it like a garment are the various worlds we have mentioned. In themselves they do not act at all. Rather, they are like a garment in which the body is clothed: it is not the garment that acts but rather the body clothed in the garment.
Similarly, this Tree acts through these garments around it. Just as the garment that clothes the active body part is included in the action, similarly the worlds surrounding whichever part of this Tree acts are also included in it. They are not there without purpose, for it is those in which the Actor is clothed that hold sway, while the Actor Himself acts in accordance with their power in executing their controlling functions. Yet it is only the Wearer of the garment who acts, not the garment itself.