The Zohar writes that Rosh Hashanah and Yom Kippur represent what it says in Shir Hashirim of Hashem’s love “His left arm is under my head”. After we pass this stage, we enter the next stage of the following Chagim. Succos and Shemini Atzeres represent the continuation of the verse; “Your right arm hugs me”. (the minimum sukkah is built in the shape of a hug)It is well known that the right represents Chesed therefore immediately following Yom Kippur the
Chesed infusion begins to take effect. This is a time to draw Chesed.
The Chesed we are referring to here are spiritual lights that are drawn to Zv”N to prepare them for their binding. This is parallel to a physical marriage. To prepare for it, we arrange a Chuppah and all its details. So too in regard to the binding of Zv”N, there needs to be some preparing in advance. This preparation is the drawing of these lights.
There are two types of lights. Internal lights and surrounding lights. Usually, these two lights come together as one light that gets divided into these two. However, now during the Chag of Succos we draw them both individually with two avodos. With the mitzvah of succah we draw the surrounding lights. And with the mitzvah of Lulav we draw the internal lights. This gets subdivided into many more details but for the sake of brevity we will suffice with
this.
A parable for this can be a cup that is immersed into a bucket of water. The water that enters the cup represents the internal lights. The water that doesn’t enter it but just surrounds it on the outside represents the surrounding lights. Every level has its own inner and outer lights. On the level of Zv”N of Atzilus the lights are also of Atzilus. So too on each level, from the highest to the lowest scale.
Originally when Hashem created the world he drew a “pipeline” into the vast Ein Sof. The light that goes through this “pipeline” is the Internal Light, and the light that remains on the outside is the Surrounding Light...