Whilst reading about the origins of Fundamentalism at Siris, and having been pondering upon the ontological possibilities for a Creator, the following scenario occurred to me (sketchily:)
......You’ve been dreaming (vividly) but now you’re starting to wake up, although you’ve still got access to your point of view within the dream. That won’t last long, but you’ve just enough time (before you leave the dream behind, as a fading set of images) for a brief action within the dream: you spontaneously say, “You’re not really real,” to the character that you’d been talking to (in your dream).
......And imagine that the characters to whom you’d been speaking (within that dream) were subjects... not in the way that telepathic intruders might (just possibly) be, their minds belonging to the same world as yours ...but because in this scenario your powers are, to that limited extent, like a God’s (a bit like how alien scientists might make intelligent computers out of inert matter).
......So, was what you said true or false? You said it because you’d just realised that you’d only been dreaming; but on the other hand you said it within the dream, to the individual that your “You” referred to. So my guess is that although it was literally true, that individual ought to think of it as a literally false metaphor (that sketchy scenario should itself be interpretted analogically:)