The Torah, “Exodus” (VaYakhel), 36:24, 36:33: And he made forty silver sockets under the planks; two sockets under one plank for its two square pegs, and two sockets under one plank for its two square pegs. And he made the middle bar to penetrate in the midst of the planks from one end to the other end.
A socket is the attribute of Bina that has to be the foundation for the building of the attribute of bestowal. The pillars, the bars, the keys, the doors, the entrances, the exits, the passages, and more refer to the composition of the desires and how they should be connected (permanently or temporarily), which desires should the Masachim (screens) be made of, etc.
The desires can be internal or external. For example, ten Sefirot of ascent can be round, which means to surround the whole structure of the soul just like our body that has internal and external organs that are surrounded by the skin, and around us there is an additional world, which is our internality, but which seems to be on the outside.
These are the methods of composing the corrected desires. After all, the main thing is how exactly they should be incorporated into one another, in which connection.
From KabTV’s “Secrets of the Eternal Book” 7/10/13