Final answer:
Flats, Platforms, and Draperies are the three traditional building blocks of fixed stage scenery still used in theater today to create immersive and versatile stage environments.
Step-by-step explanation:
The three traditional building blocks of fixed stage scenery which are still in use today are Flats, Platforms, and Draperies.
Flats are used to create walls and background scenery, Platforms are constructed to create different levels on the stage, and Draperies serve as curtains, backdrops, and a means to conceal or reveal different parts of the stage. From the earliest days of theater, where the Greeks and Romans used mechanical engineering to add spectacle and illusion, to the traditional Kabuki theaters made of wood, the use of these three elements has been persistent.
Developments over time have introduced techniques and machinery that facilitate scene changes and enhance storytelling, such as wagons and fly lofts, which add a dynamic quality to the static nature of traditional scene structures. However, Flats, Platforms, and Draperies continue to be indispensable elements within the art of scene design due to their versatility and reliability in creating an immersive experience for theater audiences.