> Probably all we would have to go on would be vestiges of memory, fleeting impressions, dreams, nebulous intuitions that somehow things had been different in s

> Probably all we would have to go on would be vestiges of memory, fleeting impressions, dreams, nebulous intuitions that somehow things had been different in some way -- and not long ago but now. We might reflexively reach for a light switch in the bathroom only to discover that it was -- always had been -- in another place entirely. One might imagine that if our past were altered such that a light switch were in a different spot, then our past experiences of flipping the switch on every morning would also have been altered, so we would not have any reflexive habit to reach for the wrong place. It seems that PKD is imagining some kind of great process of moving minds between parallel streams of the world, instead of imagining the world shifting underneath those minds. This reminds me of the "parking ramp dinosaur" in Anathem.