POSSIBLE WORLDS START WITH PLATO AND MODALITIES

Let's start small, with just one little example, to kick off the discussion of these topics.

A good, early, example of an 'impossible world' is, say, the one sketched in The Republic.

In contradistinction, the Spartan State, as it actually was, an actual city-state 'world', as we might conceive it, (not a literary fiction,) would seem to us to have been almost equally 'impossible', or perhaps better, 'unimaginable', had it not actually existed.

Theme music: The Impossible Dream