The space that remained after the restriction was circular (Baal HaSulam, The Study of the Ten Sefirot, Chapter 1, Part 1).

After the restriction, the space remains circular, meaning not in the form of a triangle or some other asymmetric object, but exactly an object where one does not have any special qualities against the other, and therefore, it has the shape of a circle. This suggests that the entire process took place in the equality and perfection of all its constituent forces.

The fact is that the restriction occurred absolutely in all parameters. There was not a single special or greater or lesser parameter in relation to the others. All the desires, all the qualities, were absolutely equivalent. Therefore, the restriction had the shape of a circle.
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From a Kabbalah Lesson The Study of the Ten Sefirot (TES) 10/2/22

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