Via Boing Boing, here’s how to fold Gaff’s origami unicorn.
In the theatrical cut of Blade Runner, the unicorn is a clue that Gaff had been at Deckard’s apartment. But the symbolism gained greater import in the director’s cut, suggesting that Deckard was a replicant:
For instance, in Ridley Scott’s 1992 Director’s Cut of the film, the filmmaker added in the famous “unicorn scene” dream sequence that appeared to confirm the Deckard-as-replicant speculation. Early in the film, Deckard dreams of a unicorn during a drunken reverie. Later, one of Deckard’s fellow blade runners, a wigged-out dandy named Gaff (Edward James Olmos), leaves an origami unicorn for Deckard to find. This suggests that Gaff knows Deckard’s memories, which means they’re implanted, which means he’s a ‘bot.
I don’t personally think he was a replicant, but I love the debate.