-Under Construction-Blade Runner takes place in a dystopian future version of LA, features psycho badass androids, and is one of the best sci-fi movies ever made.
Philip K. Dick had probably been a favorite of many sci-fi directors for a long time. His writing isn't eloquent or particularly stylish, but his ideas are so deep and mind-blowing that they tend to carry every damn book.
"Do Androids Dream of Electric Sheep?" was no different. It didn't read like a classic exactly, but something about the story just made it one anyway. The story started with a simple idea; in a future where androids appear human, somebody will have to be able to tell them apart, especially if it involves a crime. Deckard is a cop with unexplainable abilities in this area, and he is sent to handle a tough case involving androids and murder.
People wanted to make a movie out of it almost right away, including Martin Scorsese. When it was time to turn the novel into a screenplay, a lot of things changed. Amazingly, they changed for the better. While no other movie had been better than the book it came from, Blade Runner managed to finally do it.
Philip K. Dick himself had been unsatisfied with most of the screenplays he was shown, but finally David Peoples (also known for "Unforgiven" and "12 Monkeys") wrote one he liked. When shown a test reel of special effects, Dick was equally happy with the results.