Graffitti works are for the most part illegal and entail some type of trespass or some transgression against the owner of the property that the work is executed on. Many graffitti writers conceal their identities with signature/names that protect them from being easily tracked down Most local graffitti work operates within an aesthetic subculture that is concerned with formal issues of craft and execution. Overtly political messages are not often "written" . This one appeared in 2002.