Plotclok

 

A peculiar clock that writes time on a white board with a felt-tip pen. Its design is open source and uses an Arduino board to control the mechanic arms that hold the felt-tip pen, whose software can be found on Github:  https://github.com/9a/plotclock.  Most of its pieces can be made with a 3D printer.More info: http://www.thingiverse.com/thing:248009
Original video: http://youtu.be/iOLFP90DneY