It's impossible to watch modern sci-fi films and not think about the massive influence that author Philip K. Dick has had on the entire genre. For 
Popular Mechanics, I put together a list of 10 great movies that 
weren't adapted from his work but bear his trademarks. Everything from 
Open Your Eyes to 
Eternal Sunshine of the Spotless Mind was fair game -- as, of course, was 
The Matrix. 
Dive in.