This is a time-lapse video put together for Phil Lewis' piece, "The Buffalo". There were over 13 hours of raw footage for this project, which was cut down to 10 minutes. The artist tried to include most of the vital aspects of the process, shedding some light on how his amazingly detailed work comes to be.
To view the original video:
http://www.youtube.com/watch?v=XcgZxlGPiKI

To view art by Phil Lewis:
http://www.artworknetwork.com/phillewis/ (less info)