Four old companions are discussing philosophy (or some such nonsense) on a beach.
As they talk, one after another, each sees the other three being borne out to sea on the tide, until only they are left standing, alone on the otherwise deserted beach.
All four have the same experience, of seeing their three companions floating away and being lost to sight, until only they themselves are left on the beach.
Yet there is only one beach.
So the four philosophers have to ask themselves in turn: were we many, or are we one?
– Uncle Bogler