Ever wish you could write on people's walls in real life? Behold the Cellular Wall Printer, a collection of felt markers that receives messages via Facebook, Twitter, and SMS, and then transcribes them across any flat surface. Here's how it works: seven individually controlled servo motors push the felt pens up and down to leave dots and dashes in their wake. The contraption is manually operated, and Liat Segal, the inventor, adds that there's a timing system to ensure the printer transcribes neatly, even if you are in motion. Most interesting, perhaps, is the fact that the rig is controlled by an Android application, and uses an IOIO board to connect the electronic components to an Android device. (Our resident mobile expert Myriam Joire is pretty sure we're looking at a skinned Nexus One.) Check out a whimsical video demonstration after the break, with a couple more at the source link.