A collector called Richard Balzer converts phenakistiscope discs into animated gifs. He’s a wellknown lover of these early mills and has a nice collection of fenaquistiscopios, thaumatropes , zoetropes and other creations. I’ve personally always had interest in two-dimensional images moving before my eyes too.
Each disc was between 14 and 16 images by, exhibiting progress, turning a small mechanism, showed the figure in motion. Between each image was a progressive slot to ensure that the viewer can see at least the empty background.