This is a cool plot clock made by Francisco Ramos Muñoz. It uses 3 mini servo motors, one to move the draw/erase mechanism up and down and two to move the print location. The lines are nice and straight so we can tell that some kinematic techniques have been employed here. The system is being controlled using an Arduino microcontroller and is sure entertaining to watch. If you are interested in making your own you can find the instructions here.