48. The third level is Ze’er Anpin and Nukba, in which the Ḥokhma is revealed from the chest and below, since Ze'er Anpin and Nukba are the place of the revelation of Ḥokhma**.¹⁰⁰, which is described with attributes corresponding to the human body, the chest corresponds to the lower six sefirot associated with Ze'er Anpin. A level of Ze'er Anpin contains the light of giving with an illumination of the light of Ḥokhma within it. Thus, this is the third kind of “brain,” meaning a context in which the light of Ḥokhma, the “brain” of existence, is contained in a matured vessel following the previous constrictions (the first constriction and second constriction). This level is called the tzaddi of tzelem on account of the nine sefirot in Ze’er Anpin and Nukba,**¹⁰¹ and downward, the original sefira of Malkhut is missing since this original Malkhut belongs in the higher levels beyond the effects of the second constriction. Consequently, the light of Keter is also lacking in these lower levels, due to the inverse nature of vessels and lights (the loss of a lower vessel means the loss of a higher light). each of which is comprised of ten, which totals ninety, the numerical value of the letter tzaddi.

footnotes: ¹⁰⁰ In the structure of a partzuf ¹⁰¹ From Arikh Anpin

We have thus explained the three letters mem, lamed, and tzaddi in the three partzufim ofArikh Anpin, Yisrael Sabbaand Tevuna, and Ze’er Anpin and Nukba in the broad plane of the world of Atzilut. However, the same applies to the smallest of details as well, since there is no level in which these three aspects of mem, lamed, and tzaddi cannot be discerned, since there is mem, lamed, and tzaddi in each of them.