The Photon (n.) is a memory: what changed in a distant source travels across space as a lump of energy able to change something else at one precise point.
The Photon (n.) may not be an object at all, only a way of describing the relation between a source and a metal; asked where it is, it answers everywhere and at one point at once.
A Photon (n.) loses its individuality far from its source: stretch the wavelength and the grain blurs, while the field remains perfectly real.
The Photon (n.) is only part of an individual: the more energy it carries, the more individual it gets, and no source can ever make it complete.
A Photon (n.) is an individual that is also a quantity of energy, waiting to show itself in some transformation.