Answer: A black point is the only thing that was created by the Creator in the infinite Light. It is called a desire.
This point is not the egoism, but only its rudiment, something that is different from the Light. It is a point from which our development begins.
Question: What does the writing of black letters on a white background mean?
Answer: The white background is associated with the Light and the black is our desire. Therefore, when we draw lines, we represent what our desires look like on the background of the white Light, and what distinguishes them from the Creator’s altruistic attributes.
From the Kabbalah Lesson in Russian 7/17/16