Graffiti (涂鸦) and street art are forms of art created on walls or public surfaces. This art is often considered illegal because it is done without the (permit) of the building owners. These art forms (exist) since the times of ancient Greece. But the more modern style began forming in the 1960s in the cities of New York and Philadelphia. "Graffiti" often appears as words— (usual) the names of the artist or their art crew. Graffiti artists write the words in (create) ways and with colorful spray-paint.
"Street art" is more based images. Artists try to communicate a message through these images. Graffiti and street art can be controversial. They sometimes damage someone's property. Washington has tried to increase its fines for illegal graffiti, , however, is encouraging the creation of public art. America's capital city is trying hard (control) its illegal graffiti problem. At the same time, city officials recognize the value and importance of street art. There is high demand for more artists to make street art legally. But the city offers few (chance) for young D. C. street artists to develop their skills without (break) the law.