Staium seating is a technique used in performing-arts venues and movie theaters to allow more guests to see the event with less blockage than traditional seating. Like seating in a football or baseball stadium, stadium seating in theaters is usually a 30 degree slope stepped upwards from the bottom of the theater, as opposed to the approximately 15 degree gentle slope in traditional theaters. This slope improves sightlines for visitors and reduces the chance that a tall person will block the view of a short person behind them. Sometimes the sloping floor is not stepped, with the disadvantage that items can roll down.