16mm acetate education educational entertaining entertainment equipment feed films gauge length light long metal movies perforated perforation plastic plastics projection projectionist projector reels screen screening showing Sizes spools standard width wind winding abstract appearance architectural architecture backdrop background connected connections contrast contrasting dark display distant green modern modernistic paneling panelling raised ribbed ribs round silhouettes surface surfaces texture textured textures window window-screen greyscale care clean cleaning cleaning the computer computer desktop dust electronics flat screen hand housework indoor laptop left handed monitor office plasma professional rag rubbing scene technology television textile tv wiping