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 angles appearances architectural architecture background basic brick wall bricks building cement color colors colour colours firm mortar perspectives rough solid strength surface surfaces texture textures traditional brick wall wall wallpaper walls brick-wall cream secure traditional-brick-wall abstract appearance brick colored coloured exterior external smooth textured uneven variation varied various fence