Additional
Information: Altering outdoor advertising to subvert its message.
Called "billboard liberation" or "billboard improvement" by its proponents. Called "vandalism" by its opponents.
Billboard Alteration Sites:
Billboard Liberation Front Billboard Liberation Front: "Improving" outdoor advertising since 1977. Includes how-to manual for altering outdoor advertising. (Billboard Alteration) http://www.billboardliberation.com/
Culture Jammer's Encyclopedia: Billboard Liberation Culture Jammer's Encyclopedia: Billboard Liberation: Includes gallery with dozens of examples of liberated billboards. (Billboard Alteration) http://www.sniggle.net/Billboard/
Smashing the Image Factory Smashing the Image Factory: A complete manual of billboard subversion and destruction. Humorously ranges from the innocuous to the terrorist. (Billboard Alteration) http://www.eco-action.org/dt/smashing.html
Ron English POPaganda! Ron English POPaganda!: Prolific producer of surreal and parodic billboard art since 1982. (Billboard Alteration) http://www.popaganda.com/
Cicada Corps of Artists Cicada Corps of Artists: "Cicada billboard alteration embraces the idea of using the negative against itself." (Billboard Alteration) http://www.escape.com/~cicada/
Additional
Information: Altering outdoor advertising to subvert its message.
Called "billboard liberation" or "billboard improvement" by its proponents. Called "vandalism" by its opponents. 
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