The Zohar, Chapter “VeYechi (And Jacob Lived),” Item 392: A wall is the Lord of all the land, Divinity, as it is written, “Behold, the ark of the covenant of the Lord of all the earth.” Thus, the ark of the covenant, Divinity, is the Lord of all the earth, which is a wall, and for this reason, “Hezekiah turned his face to the wall.”
We must turn to Malchut, our collective spiritual vessel (Kli, desire) where we are all connected. This is called “turning to the wall” with a request that we want to wholly assemble it and to see that it separates us from the Creator.
As we restore this wall by uniting all our desires, it begins to link us to the Creator and transforms from a separating screen into a connecting one.
What is the condition that makes it possible? If we “recline,” meaning we do not perform any actions ourselves, then the Rosh (head), Toch (body), and Sof (extremities) of our spiritual Partzuf (soul) are on the same level. Thus, we turn our face to the wall and wish for our connection to truly become a connecting point to the Creator.