Banksy's graffiti often represents the universal cultural idea of challenging authority and the status quo. His work often includes political and social commentary, and his use of public spaces to convey his messages highlights the power dynamics at play in society. By using often controversial and illegal means of artistic expression, Banksy's work also challenges the notion of what constitutes art and who gets to decide what is allowed to be displayed in public spaces. Overall, Banksy's graffiti can be seen as a reflection of the desire for free expression and resistance against oppressive systems.