  Within the framework of quantum electrodynamics (QED), vacuum is a nonlinear
medium which can be linearized for a rapidly time-varying electromagnetic field
with a small amplitude subjected to a magnetostatic field. The linearized QED
vacuum is a uniaxial dielectric-magnetic medium for which the degree of
anisotropy is exceedingly small. By implementing an affine transformation of
the spatial coordinates, the degree of anisotropy may become sufficiently large
as to be readily perceivable. The inverse Bruggeman formalism can be
implemented to specify a homogenized composite material (HCM) which is
electromagnetically equivalent to the affinely transformed QED vacuum. This HCM
can arise from remarkably simple component materials; for example, two
isotropic dielectric materials and two isotropic magnetic materials, randomly
distributed as oriented spheroidal particles.
