What is a versatile type of set that allows for changes with minimal alterations or additional pieces?

A unit set is a versatile type of stage design that allows for multiple locations or scenes to be depicted without the need for extensive changes or multiple set pieces. It typically consists of a single, cohesive structure or several interconnected parts that can be easily adapted or rearranged to suggest different settings. This design flexibility means that a unit set can be efficiently used in various productions, enabling quick transitions between scenes while immersing the audience in the narrative.

In contrast, a backdrop set primarily relies on painted backdrops to create the illusion of different environments, which may not provide the same level of flexibility. A fixed set is stable and does not allow for changes, limiting its ability to depict multiple locations. An environmental set typically interacts with the performance space, but might require additional elements or changes, thus lacking the adaptability that a unit set offers.