For twenty-five years London has been subject to a beautiful onslaught of criminal activity, reprehensible to some, embraced by others, colourful, witty and provocative. Street art, phenomenon of the 1990s, developed from graffiti art, a phenomenon of the 80s, and is today a regular occurrence on London’s streets; in some areas it is ubiquitous. The appeal of street art includes its unpredictability, illegality, the challenge it poses to authority, the altruism of the street artist, and the romance and poetry of the work. Exposed to the ravages of urban life, street art can be considered transient, delicate, beautiful and fragile – as a butterfly or wild flower in spring. Done well, it reaches out and touches your soul, increasing the quality of your emotions as you trudge through the city.