ABSTRACT
If the theatre can be used as a lens to look at the question of expression in eighteenthcentury architectural theory, it is because since the beginning of the century, theatricality of social life had extended gradually beyond the physical boundaries of theatre buildings and out into the city. The role of theatre became much broader than simply a form of entertainment; it changed how individuals related to one another in society. Acting was no longer restricted to the performing stage in theatres; it became a way to conduct oneself in society.
