INTO THE MAINSTREAM While efforts to combat street art continue, its acceptance seems to be growing in the cultura world, which may not be good for "real" street art. As its acceptance has grown, street art has started showing up everywhere. There are books about the topic, it is the main focus of magazines, and blogs display daily photos of street art from more and more cities around the world. A city's well-known street art appears in guides for tourists. Visitors to Berlin can even take a class on street art as they study local examples. Some artists have stopped limiting themselves to using the streets as a canvas and begun using actual canvases, which then sell in galleries for high prices. Street art has been featured in world-renowned museums and gallery shows Banksy, the world's most famous street artist has sold individual pieces for tens of thousands of pounds, and celebrities are buying works by street artists from Brazil and Japan. Thousands of visitors came to inspect the work in a 2011 treet art museum exhibit in Los while Angeles neighbors complained that because of the exhibit, more graffiti was appearing on nearby walls. Major companies pay graffiti artists to do advertisements for them. They spray-paint cars, soft drinks and shoes on walls and plaster up posters with a street-art aesthetic