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"Thaumatropes are the first of many optical instruments developed to study persistence of vision. They typically consist of a cardboard disc with thread attached on the left and right sides. On each side of a round piece of card stock is a picture, painting or illustration. The images are designed and placed so that when the disc is spun by rolling the threads back and forth between the fingers and thumbs. The faster the disc is spun back and forth, the more the two pictures appear as one!"

This link is extremely helpful and must be on our wiki. it shows and compares dvds to bluray and how bluray discs became mainstream.