I was watching a Hunter S. Thompson profile called, Buy the Ticket, Take the Ride, and there's a part where Thompson talks about typing out whole sections of novels from Hemingway, Faulkner and Fitzgerald. His motivation, says a friend on the program, was because, "I just want to feel what it feels like to write that well."
Thompson later described it as almost like performing a piece of music.
This process, apparently, has a healthy history. And a present, it seems.
I may have to try it out sometime.