Réponse :
1. Modern graffiti seems to have appeared in Philadelphia in the early 1960s.
2. Some of the earliest expressions of street art were certainly the graffiti which started showing up on the sides of train cars and walls. This was the work of gangs in the 1920s and 1930s New York.
3. Street art is a form of artwork that is displayed in public on surrounding buildings, on streets, trains, and on other publicly viewed surfaces.
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