What can we apply about postmodernism in the arts to study the form (genre and style) of Banksy?
Postmodernism questions reality and “progress”, and turns it upside down (subverts), just like Banksy subverts not only the art world but also social roles (rich vs. poor, soldier vs. little girl, snow represented as pollution)
By breaking all the rules and in the process he encourages you (“the people”) to do the same.
Subversive: changing, inverting the system, the establishment, the political power
Use of irony (visual sarcasm) and hyperbole (extreme exaggeration)