The world of Nekudim is the material out of which all the details divide up.
Nekudim is single material — one cosmic substance from which all later distinctions emerge. The yesh me-ayin (something-from-nothing) doctrine operates here at the cosmogonic level.
Op. 39 names the second general principle of the Nekudim unit. The first principle (Op. 37) was about damage-and-repair as the root of all later cosmic operations. The second is about the material out of which the cosmic structures are built. Nekudim is one material, not many.
The Sefer Yetzirah's Tzur Tak doctrine — the unique creative power producing yesh me-ayin (something from nothing) — is what Klach invokes. Nekudim is one material: not many substances combined, but a single cosmogonic substance that divides up into all the details we see. The divisions are operational divisions of the same substance; they are not divisions into different things.
This matters because it preserves the unity of the cosmos even through the apparent multiplicity of Sefirot, Partzufim, worlds. Behind every distinction, the same single material is operating. The radical leap of yesh me-ayin — something genuinely new emerging from nothing — happens at the production of Nekudim's single material; everything that follows is division and articulation of that material.
Op. 40 will describe how the single material divides up. The radical-leap claim of yesh me-ayin operates throughout the book wherever cosmic novelty is named — most pointedly at Op. 49 (the production of evil and its future return to good — evil as a cosmic novelty in the order of being).