It is typically outdoors. Common in modern playgrounds are play structures that link many different pieces of equipment. Playgrounds often also have facilities for playing informal games of adult sportssuch as a baseball diamonda skating arena, a basketball courtor a tether ball. In some parts of the United States, the term tot lot may be used. A type of playground called a playscape is designed to provide a safe environment for play in a natural setting. In tandem sex in the play ground the new concern about the danger of roads, educational theories of play, including by Herbert Spencer and John Dewey inspired the emergence of the reformist playground movementwhich argued that playgrounds had sex in the play ground value, improved attention in class, enhanced physical health, and reduced truancy.