Protons { fermionic hadrons/heavy matter } have not been shown to decay of their own accord.

Entropy does not decay photon {__ occupied space__ } into non-occupied space existence

At worst, entropy leads our finite, occupied space existence to a singlel very large, longest wave{ longest frequency } ergo lowest energy photon.

Our finite, __occupied space__ Universe can never ever become non-occupied space.

Physical/energy cannot be created nor lost. Naught is lost or created all is eternal transformation.

The jitterbugging 4-fold cubo{6}-octa{8}hedron ---aka operating system of Universe-- contains/embraces and transforms into the three ---and only three--- primary, fundamental, triangulated, regular/symmetrical and convex polyhedra Universe.

3-fold tetra{4}hedron > 4 sets of diametrically opposing triangles and vertexes/vertexia

4-fold octa{8}hedron > 4 sets of diametrically opposing triangles

---------------------------------------------------------------------------------

5-fold icosa{20}hedron > 4 sets of diametrically opposing triangles

The cubo-octahedron also transforms into Euclidean topology of two sine-waves, at 90 degrees to each other, just as we find with a photon { EMRadiation }.

The cubo-octahedron also transforms from positive { convex } Euclidean curvature, into negative { concave } Euclidean curvature aka saddle-shape.

The cubo-octahedron also transforms into clam-shell shape having topoolgy of 4 negative and 4 anti-negative, Euclidean curvatures.

The cubo-octahedron also transforms into a tube pattern via two quasi-octahedra.

The cubo-octahedron also transforms into a seemingly 2D hexagon that has a 7th triangular tail wing set, as if to say, I refuse to collapse into inflexible 2D space only. Its profile from side view, kinda of looks like this ______/\__

Remember that, there are other transformations that lead to 2D of triangles only, however, the hexagon specifically, in 2D, has most bonded/valenced set of edges/chords/vectors ergo the most closet-packed space in 2D.