Graffiti on the urban scene in China?

Graffiti have become ubiquitous throughout the European urban space. Spray paint has become the most widely used material for graffiti, which are often a form of artistic expression, sometimes a tool for political protest. Although considered an act of vandalism if carried out without the proprietor’s consent, the authorities seem to be negligent in applying the law, or else are unable to enforce it because of the overwhelming number of graffiti that proliferate on public walls, commercial fa..