Lego savant Hans Andersson has created an updated version of his Time Twister clock that's even more fascinating to watch. If you're in a hurry the complicated spinning mechanisms that slowly update the display will drive you crazy. But if you're a fan of brilliant Lego designers finding new uses for Mindstorms, this is right up your alley.
It's not the quietest Lego creation ever. The various plastic gears and electric motors create quite a din as they count off the seconds. So despite being completely impractical, like any Lego creation the fact that the final product works at all is what's important.