It was postulated as an explanation of the positron (e-) that as a fish moves through the water and notices water only by its absence (that is, bubbles) we live in a sea of electrons and notice positrons as the absence of electrons. The positrons occur when an electron is knocked out of its position the the electron "array" by a gamma or other ray and the positron thus formed "disappears" when an electron fills the hole.

I'm sorry I wasn't clear in my earlier post. This explanation was first given back in the 1930s by Fermi or Bohr or Heisenberg or somebody famous whose name escapes me at the moment.