The existence of social classes that are too far apart causes difficulties for certain groups of society to express their artistic activities. As a result some individuals use means that are almost available throughout the city, ie walls. 
Arts education that causes less objects that often appear in graffiti in the form of writings or passwords that are only understood certain groups. Usually this work shows dissatisfaction with the social conditions they experience.
Although graffiti is generally destructive and leads to high maintenance costs for urban cleanliness, graffiti remains an artistic expression to be respected. There are many famous artists who started their career from graffiti activities.