Can anyone tell me the true nature of a photon? One physist tells me they don´t exist, another says they vary in size and now I am told they are paired masses. When I originally asked if one could split the photon, I thought it was partially material, i.e. consisting of colour with an element of weight and partially made out of, well, energy. I would also like to know if photons can be artifically manipulated, especially with regard to their size? I choose to call them wave packets. Would this be correct?