Peking opera stages have traditionally been square platforms. The action on stage is usually visible from at least three sides. The stage is divided into two parts by an embroidered curtain called a "shoujiu". Musicians are visible to the audience on the front part of the stage. Traditional Peking opera stages were built above the line of sight of the viewers, but some modern stages have been constructed with higher audience seating. Viewers are always seated south of the stage. Therefore, north is the most important direction in Peking opera, and performers will immediately move to "center north" upon entering the stage. All characters enter from the east and exit from the west. In line with the highly symbolic nature of Peking opera, the form uses very few props. This reflects seven centuries of Chinese performance tradition. The presence of large objects is frequently indicated through conventions. The stage will almost always have a table and at least one chair, which can be turned through convention into such diverse objects as a city wall, a mountain, or a bed. Peripheral objects will often be used to signify the presence of a larger, main object. For example, a whip is used to indicate a horse and an oar symbolizes a boat.