Class Eight.

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.