 It is easy to understand the problem.If there is an insubstantial being, "in Athens" somehow present in Socrates, causing him to be substantially present in Athens we seem to be faced with an infinite regression, for there would seem to be an insubstantial Socrates in the insubstantial Athens in Socrates, in Athens, etc.Ultimately, who is to say who is the real Socrates and what is the real Athens?