In modern times, paint, particularly spray paint, and marker pens have become the most commonly used graffiti materials. In most countries, marking or painting property without the property owner's consent is considered defacement and vandalism, which is a punishable crime.
Graffiti may also express underlying social and political messages and a whole genre of artistic expression is based upon spray paint graffiti styles. Within hip hop culture, graffiti has evolved alongside hip hop music, b-boying, and other elements. Unrelated to hip-hop graffiti, gangs use their own form of graffiti to mark territory or to serve as an indicator of gang-related activities.
Controversies that surround graffiti continue to create disagreement amongst city officials/law enforcement and writers who wish to display and appreciate work in public locations. There are many different types and styles of graffiti and it is a rapidly developing art form whose value is highly contested, reviled by many authorities while also subject to protection, sometimes within the same jurisdiction.
The term graffiti referred to the inscriptions, figure drawings, etc., found on the walls of ancient sepulchers or ruins, as in the Catacombs of Rome or at Pompeii. Usage of the word has evolved to include any graphics applied to surfaces in a manner that constitutes vandalism.
The earliest forms of graffiti date back to 30,000 BCE in the form of prehistoric cave paintings and pictographs using tools such as Animal bones and pigments. These illustrations were often placed in ceremonial and sacred locations inside of the caves. The images drawn on the walls showed scenes of animal wildlife and hunting expeditions in most circumstances.
The only known source of the Safaitic language, a form of proto-Arabic, is from graffiti: inscriptions scratched on to the surface of rocks and boulders in the predominantly basalt desert of southern Syria, eastern Jordan and northern Saudi Arabia. Safaitic dates from the 1st century BCE to the 4th century CE.
Theories on the use of graffiti by avant-garde artists have a history dating back at least to the Scandinavian Institute of Comparative Vandalism in 1961. Many contemporary analysts and even art critics have begun to see artistic value in some graffiti and to recognize it as a form of public art.
According to many art researchers, particularly in the Netherlands and in Los Angeles, that type of public art is, in fact an effective tool of social emancipation or in the achievement of a political goal.
