How does an Etch a Sketch Work?

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In this video:

An Etch a Sketch is a remarkably simple device. The primary components are just a small sheet of glass; a stylus controlled by two knobs; very fine aluminum powder; and tiny plastic beads. The tiny beads are mixed in with the powder to make sure the powder will continue to flow evenly and not get clumped together, as well as aid in the re-coating process when you shake the Etch a Sketch.

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Sources:

http://en.wikipedia.org/wiki/Etch_A_S...
http://web.mit.edu/invent/iow/etchy.html
http://www.howstuffworks.com/question...
http://www.thereporteronline.com/arti...
http://targetstudy.com/knowledge/inve...
http://en.wikipedia.org/wiki/Talk%3AE...