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
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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.