A drive-in theater is a form of cinema structure consisting of a large screen, a projection booth, a concession stand and a large parking area for automobiles. The screen can be as simple as a wall that is painted white, or it can be a complex steel truss structure with a complex finish. Within this enclosed area, customers can view movies from the privacy and comfort of their cars. Some drive-in theater managers added children's playgrounds between the screen and the first row of cars. Others even went as far as adding miniature railroads, merry-go-rounds, and mini-golf. Concrete patios for lawn chairs were available at some drive-in theaters, as well as indoor seating in the snack bar.