  Structures which appear to move at or near the velocity of light contain
singular points. Energy generated by the motion accumulates at these points
into ever-narrowing peaks. In this paper we show that energy is generated by a
curious process that conserves the number of photons, adding energy by forcing
photons already present to climb a ladder of increasing frequency. We present
both a classical proof based on conservation of lines of force, and a more
formal QED proof demonstrating the absence of unpaired creation and
annihilation operators. Exceptions to this rule are found when negative
frequencies make an appearance. Finally we make a connection to
laboratory-based models of black holes and Hawking radiation.
