In this paper it is proved that the key to understanding the ghost imagingmystery are the crossing symmetric photon reactions in the nonlinear media.Hence, the laws of the plane quantum mirror (QM) and that of spherical quantummirror, observed in the ghost imaging experiments, are obtained as naturalconsequences of the energy-momentum conservation laws. So, it is shown that theghost imaging laws depend only on the energy-momentum conservation and not onthe photons entanglement. The extension of these results to the ghost imagingwith other kind of light is discussed. Some fundamental experiments for adecisive tests of the [SPDC-DFG]-quantum mirror are suggested.
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