CLEAN : In Belfast street art battles community rifts

The video discusses the transformation of art to be more positive and relatable, moving away from oppressive themes. It highlights the presence of underground art movements that express anger and anti-establishment sentiments due to dissatisfaction with the current establishment. The video emphasizes how art serves as a medium for expressing public sentiment and societal issues.

What does the speaker mean by 'anti-establishment stuff' in the context of art?

In what ways does the speaker believe art can express anger?