As is known, the equating of form merges spiritual entities, unifying them into one. Therefore, once the partition of the body has been purified of the opacity of the body, and all that remains in it is the same measure of opacity found in the partition of the mouth of the head, its form is equal to the partition of the head. As a result, it is incorporated within the partition of the head, literally becoming one, as there is nothing between them that would divide them into two.
This is referred as the partition of the body rising to the mouth of the head. Since the partition of the body is thus incorporated in the partition of the head, it is included again in the fusion through collision of the partition of the mouth of the head, and a new fusion through collision is performed upon it. A new structure of ten sefirot emerges from it, which is called “Ab (or ayin-bet), of Adam Kadmon,” or the partzuf of “Ḥokhma of Adam Kadmon.” This is considered a son and an offspring of the first partzuf of Adam Kadmon.