 It is common practice in Australia for the curtain to cover part of the screen during advertising and trailers, then be fully drawn to reveal the full width of the screen for the main feature.Some theaters, lacking a curtain, filled the screen with slides of some form of abstract art prior to the start of the movie.Currently, in multiplexes, theater chains often feature a continuous slideshow between showings featuring a loop of movie trivia, promotional material for the theater chains (such as encouraging patrons to purchase drinks, snacks and popcorn, gift vouchers and group rates, or other foyer retail offers), or advertising for local and national businesses.