Page "Zoetrope" Paragraph 13
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Wikipedia
At around the same time, the San Francisco Bay Area Rapid Transit ( BART ) system installed a zoetrope-type advertisement between the Embarcadero and Montgomery stations which could be viewed by commuters traveling in either direction.
The BART ads are still visible, though they are changed infrequently: a particular ad may remain up for several months before being replaced.
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