Take a look at this phenomenal video clip, during which Leah Buechley showcases a kit designed for "sketching" electronics. You have a pair of magnetic electronic parts, with a pencil that features ink that is conductive. Therefore you can easily sketch you're special electronic wiring. At around 1: 20 you will see the culmination of the basics she makes noticeable in the first part of this video.
youtube.com
youtube.com