XP3 Ultra Clock, a " persistence of vision " clock - $59.95This one's a classic, but it'... ...oscillating wand with LEDs and the concept of the persistence of vision to tell time and display messages. You can even p... .......
https://www.neatorama.com/2009/09/12/xp3-ultra-clock-using-persistence-of-vision-to-tell-the-time/
XP3 Ultra Clock: Using Persistence of Vision to Tell the Time
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