Based on unnamed designs by Belgian physicist Joseph Plateau, the phenakistiscope was an optical illusion instrument popular in the 19th-century.
Phenakistiscopes usually come in the form of a spinning cardboard disc attached vertically to a wooden handle. Arrayed radially around the disc's centre are a series of pictures showing sequential phases of the animation and small rectangular apertures are spaced evenly around the rim of the disc. The user would spin the disc and look through the moving slits at the images reflected in a mirror as they appear to be a single moving picture.
Size: The Phenakistiscope includes 12 - 20 cm (7.87 inches) reproduction discs that feature period-accurate images created by Plateau in the 19th-century.