" The invention of the roll of film, made possible by the use of celluloid plastic, led directly to the technology of motion pictures. The idea that a picture could be made to “move” by sequentially showing small changes in the image had been known for hundreds of years, but without a flexible transparent material, the only way it could be made to work was using the rotating cylinder of a zoetrope. Celluloid changed everything, allowing a sequence of photographs to be taken on a roll of film and then played back fast enough for the picture to appear to move. This not only allowed a longer sequence of motion to be shown than with the zoetrope, but the moving image could be projected, and so the experience could be shared by the whole audience of a theater. This was the key insight of the Lumière brothers and led to the establishment of the cinema. "

― Mark Miodownik , Stuff Matters: Exploring the Marvelous Materials That Shape Our Man-Made World