Street arts stage artistic activities that lead to the emergence of new cultural activities. The leading purpose of street arts is to promote and to make more dynamic territory, to take young people toward the formation, then the promotion of their art and successfully combine conviviality and exchange, good mood and pleasure. After all is said and done, to create, to arose, to surprise, to improvise… Street arts explore and invent new territories. Take graffiti, for example : these inscriptions are everywhere, graffiti or tags or fresco have monopolized our urban landscape, graffiti artists sign undergrounds, trains, walls… these young artists, vandals or delinquents claim graffiti like an art, while for others they are an act of vandalism and degradation. To the young people it's as good a way as any other to make their name travel and to be considered by a maximum of people. Street arts are often passions ; to graffiti artists it’s a good way to pit themselves against the others. Street art is a way to express oneself which concerns more and more artists nowadays.