It may not be the most practical way of finding the time, but you have to admit, the Aspiral Clock is pretty cool.
Created by London-based designers Will Aspinall and Neil LambethMade, the Aspiral Clock turns slowly over a twelve-hour period while a loose ball inside marks the current time. When the clock reaches the final twelfth hour, it drops through a hole and starts all over again.
The kinetic energy clock is 15 inches (35cms) in diameter and available in a range of colors. You can pick one up here, for $500.