Have you ever been to a concert, especially at the Warfield in San Francisco, where a few LEDs on the end of a plastic rod are spun around and cause a message to be displayed? Or have you seen the clock that displays the time by quickly moving a pendulum-like device back and forth? They're typically sold by Brookstone or Sharper Image (or you can see one such clock here). Anyway, the folks at UCB have developed a persistence of vision device using Moteiv's Tmote Sky modules shown in the picture below. Check it out.

http://www.makezine.com/blog/archive/2006/01/wirelessly_updatable_pov.html

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