Throughout the ages, theatres have provided two essentials such as a platform for the performers to act and a place to entertain the audience. A theatre may be a purpose-built environment. Theaters provide the setting for performances of all kinds, from plays to opera and from puppet shows to dance. Modern theatres have a huge pool of workers including craft worker, set designers, makers and costumiers as well as the actors themselves. In 1800's drama became more realistic, with elaborate scene changes. Theatre structure reflected its functions.