How did A Burial at Ornans challenge the traditional hierarchy of painting subjects?

Gustave Courbet’s A Burial at Ornans (1849–50) challenged the traditional hierarchy of painting by applying the monumental scale previously reserved for "important" subjects—such as historical, religious, or allegorical scenes—to a contemporary, mundane funeral of an unnamed rural individual.1

In the 19th-century art world, large-scale canvases were intended to convey heroism or grand narratives, while scenes from everyday life, known as genre paintings, were traditionally relegated to small-scale works. By depicting local laborers and middle-class figures on a massive scale (approximately 10 by 22 feet), Courbet subverted these expectations, effectively ennobling the ordinary lives of his contemporaries.1

Furthermore, the painting rejected the idealization common in academic art. Instead of presenting a glorified or spiritualized event, Courbet portrayed the burial with stark, unadorned factuality, focusing on the commonplace appearance of the mourners and the lack of religious transcendence. This refusal to embellish, combined with his use of rough, visible brushstrokes, challenged the prevailing standards of illusionism and helped establish the foundations of Realism.12