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A photograph is simply a photon's recorded wave function. It ripples through spacetime and is possible due to it being electromagnetic fields. Digital cameras treat its fields like a solar panel would. Why it act like this is in order for a photon to get its wave function quantization exist. So all in all it is just the energy of quantization. Possible due to the mathematical nature of the universe. And all of this photography is possible because a photon's wave function can be accumulated enough to be recorded. The joke I make about this is that it is like engineering an image from how a camera is exposed to the scene it sees from the ripples of light.