yeah, SHUTTER ISLAND is exactly the kind of thing i'm thinking of. MEMENTO is an interesting slant on this theme. The reality doesn't change, and he knows he doesn't know what it really is, but he just keeps becoming more and more aware of the truth. A great movie. SOLARIS (the Russian version) put me to sleep, so i'll have to take your word that it fits. GROUNDHOG DAY, while a great movie, isn't exactly what i'm talking about. the key question to ask is: "what does the protagonist think his reality is, and does the movie reveal him to be wrong?" In GD, Murray understands early on that his reality has changed and then spends the movie trying various ways to deal with that fact, to get back to his own "time" (as it were), to bang Andie McDowell (a worthy ambition) and then simply to live the best he can in his altered reality. This zen-like approach finally breaks the curse and he's restored. But the protagonist is never really wrong, nor does he have any doubts, about the fact that his reality has changed or what it has become, even if he has trouble accepting it at first. As for DISCREET CHARM, most European art films, and certainly most of Bunuel's, have a surreal attitude toward reality and so could technically fall within my definition. But they are primarily metaphorical and symbolic, with no attempt to construct a reality that reflects the world, so how can the protagonist be wrong about his reality when no reality is posited? So i'm arbitrarily excluding them. With SLIDING DOORS, i know what the story is about, offering 2 versions of reality based on changing the results of a single decision, but unless the Paltrow character thinks she's in one reality while she's in the other, it doesn't fit either. The essence of the conflict i'm trying to identify in films is that between the protagonist and what they understand to be their world. What happens when the world isn't what you thought it was? Films that deal with that question are the ones i'm looking for.