Perhaps an oldie again, but I saw this in another forum and was astounded:
http://www.ericharshbarger.org/cgi-bin/photo.cgi?clock_5.jpg+lego/images/clock
It is a series of pictures of a working, accurate clock, made completely from 100% Lego parts! (And not some fancy proprietary pieces meant for making Lego clocks either, but some amazing ingenuity with the Technic line)
http://www.ericharshbarger.org/cgi-bin/photo.cgi?clock_5.jpg+lego/images/clock
It is a series of pictures of a working, accurate clock, made completely from 100% Lego parts! (And not some fancy proprietary pieces meant for making Lego clocks either, but some amazing ingenuity with the Technic line)