YouTube link.
The
Antikythera Mechanism has been featured a number of times on Neatorama, including a
working model created in 2008. This year a fully functional replica has been created using Lego materials. Since gears with 19, 47, 127, and 223 teeth were not publicly available, a complex differential shaft had to be fashioned.
Two Nature videos about the original Antikythera Mechanism are available at
The Guardian.