OPTICAL TOYS THAUMATROPE- “The Spinning Wonder” When your eye sees an object, it holds on to a picture of that object for a fraction of a second while it “talks” with the brain- this is why sometimes you see an object for a split second after it is gone. This phenomenon is known as Persistence of Vision. As you spin the Thaumatrope disc, you can see each picture long enough to have two images merge into one. You will need: - thin piece of cardboard - hole punch - pencil - scissors - glue - string

Directions: Cut both discs out and glue together for thickness (pictures facing out and top sides up). Using scissor point, punch holes evenly on the sides and tie string in them as shown. Twist the string back and forth between your thumb and forefinger to spin the disc and see two pictures as one!