Is there a faq on origami?

Advertising blimps float over the dark sprawl of 2019 Los Angeles; their searchlights penetrating into every dark corner, as seen when Deckard enters the Bradbury building. This gives the impression that the population is always being watched. Even Deckard seems to be watched by Gaff. The way Gaff interacts with Deckard implies that Gaff is Deckard's "handler" and Gaff also seems to know things about Deckard that Deckard doesn't even know. For example, the origami unicorn presumably left by Gaff, leads the audience to believe Gaff knows the truth of Deckard's humanity.