This is a short survey of street art which is a (somewhat) commercial outgrowth of graffiti. The author does not say it outright, but street art appears to be a legal (or at least quasi-legal) form of graffiti. Urban art which can be either is a commodity that can be owned and collected.The book, which focuses on street art, has examples of all three forms from around the world.
The evolution (graffiti to street art to urban art) can be seen in Banksy of the UK who popularized stencils (speed is needed when you create illegal art) which is a common method of creating street art and in Shepard Fairley, who created the graffiti image that became the Obama–Hope image which is street art in that it appears everywhere (legally and illegally) and urban art in that it is marketable and collectable.
You learn the vocabulary specific to these art forms. A “throw up” is a big bold image, sometimes only a few letters that stand out. A “piece” is a masterpiece. “Wild style” is a new rendering of the graffiti motif that expresses the (wild) individuality of its artist. “Buff” is the act of the authorities in cleaning up graffiti. A battle of buffers and a graffiti artist is shown on pp 92-93. “Subvertising” is a graphic message added to a piece of advertising. There is a glossary at the end.
There are short write ups covering personal branding, taggers “who try to become as well known as possible, while remaining anonymous" (p.76) and the influence of hip hop.
The chapter on the global reach of street art is heavy on New York City with write ups on legends such as SEEN, Dondi, Lady Pink, Patti Astor and Keith Haring. Other places getting a short notice are Paris, Northern Ireland, Nicaragua and Cairo.
The most impressive examples of street art (for me) were from countries not listed: a face chiseled on a building by Alexandre Farto in Alamado, Portugal (pp. 20-21 – there is another in Paris is on p.130), pixacao lettering in Sao Paulo Brazil (p 78), murals in Berlin, Germany (p.122) and Luzhi, China (p.150 & p. 165) and a spray painting in Barcelona, Spain (p.133) .
There is info on the art form's influence in ads, album covers and film. Blogs and on line forums dedicated to it are mentioned. There is a section on characters, many influenced by comic books (the cover photo is an example from Paris, France). There are samples of new styles as shown in galleries and animations shown on buildings. A new format for street art is sculpture which shows the graffiti attitude.
I expect the future will see more development of “legal spaces” for which there are good examples on pp. 158-159 and 161.
This survey leaves you wanting more. The scale of the art work suggests a larger format would be appropriate.