Wired: It was never on paper that Deckard is a replicant.Q&A: Ridley Scott Has Finally Created the Blade Runner He Always Imagined
Scott:It was, actually. That's the whole point of Gaff, the guy who makes origami and leaves little matchstick figures around. He doesn't like Deckard, and we don't really know why. If you take for granted for a moment that, let's say, Deckard is a Nexus 7, he probably has an unknown life span and therefore is starting to get awfully human. Gaff, at the very end, leaves an origami, which is a piece of silver paper you might find in a cigarette packet, and it's a unicorn. Now, the unicorn in Deckard's daydream tells me that Deckard wouldn't normally talk about such a thing to anyone. If Gaff knew about that, it's Gaff's message to say, "I've read your file, mate." That relates to Deckard's first speech to Rachael when he says, "That's not your imagination, that's Tyrell's niece's daydream." And he describes a little spider on a bush outside the window. The spider is an implanted piece of imagination. And therefore Deckard, too, has imagination and even history implanted in his head.
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