Here is a robot that can draw and write on plaster and glass surfaces. The Scribit comes with app control. Simply hang it on its slim metal wire from two nails, plug it in, and connect the device to your phone. This 2-wheeled robot writes in 8 colors. It can be used to draw a map or custom drawings.
This robot can write and erase on its own. Carlo Ratti is the designer of Scribit. You can find out more about it here.