Final answer:
The realist theatre agenda included a movement towards more democratic, anti-Royalist theatrical expressions, reflecting the societal shift from neoclassicism to realism, highlighting the rise of the middle class and more historically accurate designs.
Step-by-step explanation:
Besides an aesthetic overhaul, the realist theatre carried an agenda that included a rebellion against the contrived manners of the Royal era and the creation of a theatre with a distinctly democratic, anti-Royalist air. Realist theatre emerged as a response to social changes in the 19th century and aimed to mirror society, thereby acting as a direct observation of human behavior. This was a significant shift from the earlier neoclassical ideals of Italian theatre, which emphasized purity of genre, verisimilitude, decorum, structure, and purpose as laid out by Horace in Ars Poetica. Additionally, the introduction of more historically appropriate scenery and costumes became prevalent.
Realism in theatre also signaled a shift in societal structure, examining the downfall of the noble class and the rise of the middle class. This shift was clear in the themes and character portrayals on stage, which reflected the emerging economic and social realities of the time. The Proscenium Theatre evolved to support the changing storytelling styles, employing new innovations over the neo-classic ideals of large semi-circular seating and ornate design common in earlier Greek and Roman-inspired theatres.