Effective Electric & Magnetic Fluids

In a vacuum, electromagnetism can be understood in terms of effective incompressible fluids:

OBJECT	CORRESPONDENCE
electric field	electric fluid velocity
magnetic field ⋅ speed of light	magnetic fluid velocity
charge	electric fluid mass rate
current density	electric fluid density ⋅ acceleration
electric constant	electric fluid density
magnetic constant ⋅ speed of light squared	reciprocal of magnetic fluid density

Accelerations create vortices.  Circulations equal acceleration fluxes divided by the speed of light.