clockwork.

Here's another awesome clock, this one by Henk Stallinga. I found it over at Propeller Modern (which sadly does not have a direct link, so check the Accessories part of their menu). It's a modern reinterpretation of the grandfather clock. The top tells time, and the bottom is the pendulum. They're not actually connected in anyway (and run on separate batteries) which is kind of a shame, but the idea is still cool. Comes in three colors and costs $75.