The first cascade
Bilateral geometry does not produce all numbers equally. It generates a specific sequence: starting from the bilateral ground state (0, 1), it builds through the primal objects (2, 3, 4) and continues to their products and combinations, culminating at 12 — the first position where Nyx and Eros have fully intersected.
Twelve is Nyx times Eros: 3 × 4. This is not a coincidence of arithmetic. The triangle (three-fold closure) applied to the four-region bilateral map produces twelve positions. The stella octangula — the geometric core of CET's cascade structure — has twelve edges. The first cascade closes at 12.
Thirteen is where the cascade runs out of room. The 12-dimensional structure has no containing fold at position 13. Energy moving through this structure past position 12 is no longer contained by the first cascade's geometry. This is not "12 + 1" — it is a structural event. The second cascade must begin here, or the structure does not hold.
This is why 12 and 13 appear together in so many natural and cultural contexts as a pair — not because of mysticism, but because the geometric transition at that boundary is real and produces observable structure.