“Graffiti are cross-cultural phenomena common to every literate society. Within the variable contexts of their production, graffiti personalize de-personalized space, construct landscapes of identity, make public space into private space, and act as promoters of ethnic unity as well as diversity. Graffiti can be understood as concrete manifestations of personal and communal ideologies which are visually striking, insistent, and provocative; as such, they are worthy of the continued attention of art historians, social scientists, and policy makers alike.”
From the ‘Dictionary of Art’, Susan A. Phillips (1996)