Map of Maamar from pp 10-63 (old edition) (pp 14-85 (new Edition)Three levels in Hishtalshelus repeated in different models 6 times – Memale / Sovev/ Atzmus Moshol of the Sun for Light. Black Light (Etzem, Atzmus) passes through the Nirtak (shield) becomes white light (Sovev) makif which shines everywhere equally passes through a second barrier…

Refutation of the initial answer: it hides much more than it reveals and therefore cannot (really) be called “Gilui” (2). Three rules of “Etzem” and Gilui. Every Tzimtzum is two Tzimtzums: 1) removing the Ohr Haoleh AL Kulana. 2) Miut (hischalkus) of the Chitzoniyus HaOhr.