Eraser

With the back frame of the Doodle Pro removed, you can see the eraser mechanism, which is the black piece of plastic that you see, with a thin rubber magnet which can be moved back and forth across the screen. The bones and footprints look like black marks on the other (front) side of the panel, and are made with magnetic "stamps" that came with this dinosaur themed set. This is part of the Evil Mad Scientist Analog PlotBot project, which features a DIY E-Paper display! Read more about this project here.