This is because all conceptuality is polyhedral. 501.12 You have to have the starkly nonvisible to provide the complementary tetrahedron to account for the visibility, since concave and convex are not the same. But the invisible outside tetrahedron was equally stark. 501.13 Complementarity requires that where there is conceptuality, there must be nonconceptuality. The explicable requires the inexplicable.
Experience requires the nonexperienceable.
The obvious requires the mystical. This is a powerful group of paired concepts generated by the complementarity of conceptuality. The invisibility of negative Universe may seem a discrepancy, but only because the conceptual is such a fantastically limited part of the total, not just in the electromagnetic spectrum range, but in metaphysical, cosmic thinkability itself. By the same logic a triangle or three-angled polygon is not only thinkably conceptual independent of size, but all its lines also terminate in angular convergences. The triangle demonstrates finite conceptuality independent of time-sizing.