The Antikythera Mechanism is thought to be a 2nd/1st century BC mechanical device for calculating astronomical positions (and thus a very advanced navigational device of its time). It was made somewhere in the Greek-speaking world. Tom Malzbender, one of the inventors of Polynomial Texture Mapping (PTM), recently gave a Google Tech Talk entitled “Imaging the Antikythera Mechanism“, showing how interactive lighting has helped to identify many previously unknown details on the device. It’s a fascinating talk, about an hour long, and worth watching to learn more about the device, what a PTM is, and its capture methods.
You can download PTMs of all fragments thanks to the HP Labs Antikythera Mechanism website.