See the POV project page at http://shrimping.it/blog/persistence-of-vision/ for all the detail.
Once built, you can work with learners to design bitmap icons on graph paper, and display the icon on your POV circuit, learning binary along the way., as shown in the smilie icon image.
@ShrimpingIt documents Arduino-compatible projects, runs workshops and sells kits below retail, introducing materials such as solderless breadboard for learners to prototype and deploy their own digitally-controlled devices. There's even an O'Reilly Make: book !