Check out this cool use of an Arduino. It's a robotic arm that writes the time, erases it, and then writes up the new time over and over again. This device gives a whole new meaning to the phrase "time stops for no man." Apparently, "time stops for no man or machine." The robotic arm was created by a hacker going by the name of Ekaggrat. Of course, I'm sure you'd like to see this in action, so take a look at the video below.
I'm not sure just how practical something like this is to replace current clocks, but it sure is cool! What a display to have in a maker-shop or robotics office. Now, if only he provided instructions and the code required so that we could all make them in our own homes!