Definition of "unfolding"

Because most diesel failures can be traced to electrical faults, minor in themselves but often difficult to pin-point, any unscheduled halt during a trial run is often the signal for the frenzied unfolding of wiring diagrams and the appearance of an impressive array of voltmeters and circuit testers.

1962 April, R. K. Evans, “The Acceptance Testing of Diesel Locomotives”, in Modern Railways, page 268

If I had the space, I'd cite dozens more examples of Gould's graceful unfoldings of various Beatle tunes.

2007 October 28, Bruce Handy, “Nothing You Can Know That Isnt Known”, in New York Times‎