What a gorgeous phenakistoscope animation of dancers!  From Wikipedia, via Morbid Anatomy. Click here to see more animations/images of the same phenakistoscope. Wikipedia gives the following information:

CREATOR Muybridge, Eadweard, 1830-1904, artist.
TITLE The zoopraxiscope* – a couple waltzing (No. 35., title from item.)
SUMMARY Images on a disc which when spun gives the illusion of a couple dancing.
MEDIUM 1 print : lithograph, color.
CREATED/PUBLISHED c1893 (14699Y U.S. Copyright Office). Copyright by Eadweard Muybridge (expired).
SUBJECTS Dance–1890-1900; Locomotion–1890-1900; Optical illusions–1890-1900.
FORMAT Optical toys 1890-1900; Lithographs Color 1890-1900.