  The Dirac equation is reinterpreted as a constitutive equation for
singularities in the electromagnetic vacuum, with the electron as a point
singularity on a lightlike toroidal vortex. The diameter of the vortex is a
Compton wavelength and its thickness is given by the electron's anomalous
magnetic moment. The photon is modeled as an electron-positron pair trapped in
a vortex with energy proportional to the photon frequency. The possibility that
all elementary particles are composed of similar vortices is discussed.
