Push the yellow button to change disk.
The phenakistoscope (also spelled phenakistiscope or phenakitiscope) was an early animation device that used a spinning disk of sequential images and the persistence of vision principle to create an illusion of motion.... (http://en.wikipedia.org/wiki/Phenakistoscope) Images: https://www.flickr.com/photos/lwr/7444716150 https://www.flickr.com/photos/ncssm/9465596705 https://www.flickr.com/photos/ncssm/9465602051 https://www.flickr.com/photos/ncssm/9465591599
