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In Majorana’s approach, a spinor wave equation describes a photon with zero mass.  The same equation with mass is is the Dirac equation for fermions.  We consider these equations on $S^4(1/h)$:
$i\frac{\partial}{\partial t} \psi + (D+m)\psi = 0$
Here is an identification of mass and energy.  The mass equation is simply the same equation with shifted Dirac spectrum, i.e. high energy photons are massive.  Either could be described using eigenspinors of $S^4$ which are known explicitly by computation of Camperosi-Higuchi and others.  Technically the note is trivial but the interpretation is valuable:  matter and energy are both aspects of spinor fields vibrating at different (but fixed and known) set of frequencies.