Define box set design in 19th-century theater.

Box set design in 19th-century theater refers to the staging technique where realistic, three-dimensional sets were constructed to create the illusion of an enclosed room or interior space on stage. This style of set design became prominent in the early 19th century and was commonly used in realistic and naturalistic plays.

Typically, a box set would consist of three flats forming the walls of the room and a fourth flat serving as the back wall. These flats were often painted or constructed to resemble the interior of a specific location, such as a sitting room, bedroom, or kitchen. The set would usually have a ceiling painted as well, adding to the overall realism and creating a sense of depth.

A distinguishing feature of box set design was the use of actual furniture, props, and other accessories to furnish and decorate the set. Realistic details, such as wallpaper, curtains, rugs, and paintings, were also added to enhance the illusion of an actual interior.

Box set design allowed for a more realistic and immersive theatrical experience for the audience. It supported the rise of realistic and naturalistic plays, where the focus was on accurate depiction of domestic and everyday life. This style of set design played a crucial role in the development of modern theater and is still used today in various forms.