Persistence of Vision (POV) works on the principle that our eyes will retain an afterimage for a certain amount of time and that whatever light "accumulates" during that time is processed by the brain. This is similar to the amount of light captured in a single photo, or frame in a video. A spinning top is a logical place to put a spinning POV platform since the motion is fast and relatively continuous. Technologically speaking, this was not the most impressive project, but the documentation was fabulous, and that tipped it over the edge making it a worthy article, in my opinion.
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