This might be one of the most inventive works of advertising and street art that i’ve seen all year! Brothers and Sisters creative duo have teamed up with anonymous German street art collective Mentalgassi, to create art installations for Amnesty International. Called Making the Invisible Visible, the posters highlight the case of Troy Davis, a 42-year-old man who has been on death row for 19 years in the USA, despite serious doubts about his conviction.