We can compare the ascents and descents to a pump in which a piston goes up and down. When the piston goes down, air is expelled from the opening in the wall of the pump. But then this valve closes and the piston begins to rise and creates a vacuum, thus pulling out part of the material from the cylinder, and it goes into your vessel. And you have to build a Masach (screen) on top of it.

This happens each time you are in an ascent or a descent. You take out some of the material of the desire from inside and add it to the work. When it enters your vessel, it’s already a desire that is ready for work. In the cylinder itself there is all the infinite desire that you gradually pump out of there, just like a pump, and it’s done by your ascents and descents.
[98727]
From the 1^st part of the Daily Kabbalah Lesson 1/24/13, Writings of Rabash

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