Artists paint all the buildings in a street. In Bristol in the UK, there is a street art festival in August every year. Some tourists visit São Paulo just to see the street art! Their pictures are colourful and beautiful. In São Paulo in Brazil, street artists can paint pictures on walls and houses. For example, in Taiwan, there are 'graffiti zones' where artists can paint on walls. In other countries, artists can draw and paint in certain places. Sometimes, graffiti artists have problems with the police. In some countries, writing or painting on walls is a crime. Other artists wanted to make cities beautiful and painted big, colourful pictures on city walls.

Some artists' pictures were about politics. In the 1990s and 2000s, a lot of graffiti artists started painting pictures. It appeared on trains, buses and walls around the world. Aerosol paint graffiti became very popular in the 1970s and 1980s. Their tags were bigger and more colourful. Then, some teenagers started writing their tags with aerosol paint. Soon, there were tags on walls, buses and trains all over New York. Other teenagers saw Demetrius's tag and started writing their tags too. He wrote his tag on walls and in stations in New York. One of the first 'taggers' was a teenager called Demetrius. In New York, young people wrote their names, or 'tags', in pen on walls around the city. Modern graffiti began in big cities in the United States in the 1970s.

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