In an earlier review of "Blade Runner," I wrote; "It looks fabulous, it uses special effects to create a new world of its own, but it is thin in its human story." This seems a strange complaint, given that so much of the movie concerns who is, and is not, human, and what it means to be human anyway. Even one character we can safely assume is human, the reptilian Tyrell, czar of the corporation which manufactures replicants, strikes me as a possible replicant. And of the hero, Deckard (Harrison Ford), all we can say for sure is that director Ridley Scott has left clues in various versions of his film that can be used to prove that Deckard is a human -- or a replicant.