I’m thinking genealogically about the ways screens come into form. Screens are never preexisting objects. What I think is essential is to highlight the struggles by which a set of technologies, processes, and spaces come together to make new kinds of screens. A surface becomes a screen through set of apparatuses and political processes.
We encounter a range of objects we don't normally think of as screens: shields, smoke, facades, etc
For most of its history the screen was a filter, a shelter, a divide, or a form of camouflage. It's worth thinking about those histories as screens become more spatial and more environmental.
Thinking about the screen's spatial function means thinking about its history. Only since the 19th century does a "screen" mean an optical surface. Before the 19th century the screen meant something very different. A diorama was a complex mechanism that was thoroughly architectural -- there was no screen without a spatial mechanism.