"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. Now study that paragraph again and notice I have committed a journalistic misdemeanor. I have referred to replicants without ever establishing what a replicant is. It is a tribute to the influence and reach of "Blade Runner" that 25 years after its release virtually everyone reading this knows about replicants. Reviews of "The Wizard of Oz" never define Munchkins, do they? This is a seminal film, building on older classics like "Metropolis" (1926) or "Things to Come," but establishing a pervasive view of the future that has influenced science fiction films ever since. Its key legacies are: Giant global corporations, environmental decay, overcrowding, technological progress at the top, poverty or slavery at the bottom -- and, curiously, almost always a film noir vision. Look at "Dark City," "Total Recall," "Brazil," "12 Monkeys" or "Gattaca" and you will see its progeny. I have never quite embraced "Blade Runner," admiring it at arm's length, but now it is time to cave in and admit it to the canon."