Out of bounds (Playgrounds)
An out of bounds or restricted area in playground terminology usually depends on inside or outside playgrounds, but the core meaning is an enclosed space of either walk in or crawl in dimensions usually restricted to children. Indoor playgrounds. The out of bounds area in indoor playgrounds is an enclosed space usually located either aside tunnels, under a slide or stairs, or under a twirling slide. These are often restricted areas for maintenance access only. Usually one of the out of bounds areas of the indoor playground houses an electrical indoor power generator connected by wiring  and cords, usually to only be accessed by maintenance workers and staff only. These restricted areas are easily accessible by children, especially when the zipper to the space is open. The cover could be of various color, and is made out of either playground netting or the materials for one of the climb tunnels (a square patterned netting). The reason why children are not admitted inside these spaces is because the potential for the child to get trapped in the space. Another reason why is because of the electrical generator in one of the spaces, resulting in a child messing  up the generator and randomly unplugging/plugging in electrical cords, plus the risk factor for electric shock to the child from the cord and potential cord damage. Adventure parks responded to some incidents of children trapped in the spaces, thus not allowing children. McDonald's playplaces have out of bounds areas that aren't accessible by children. It could also be a separate area containing either nothing, or a power outage device like a generator for example. Outdoor playgrounds. An out of bounds area outside refers to a small corridor usually located behind a "deck" structure of the playground (consisting  of a square-shaped with a hole and platform raise construction that children can play pretend restaurant in) or behind a ladder. Children can easily bump their heads onto the "ceiling" that is the ground of the actual playground structure and experience a minor head injury, which is why children aren't recommended into go under there.