Banksy is a pseudonymous English graffiti artist, political activist, film director, and painter. His satirical street art and subversive epigrams combine dark humour with graffiti executed in a distinctive stencilling technique. His works of political and social commentary have been featured on streets, walls, and bridges of cities throughout the world. Banksy's work grew out of the Bristol underground scene, which involved collaborations between artists and musicians. Banksy displays his art on publicly visible surfaces such as walls and self-built physical prop pieces. Banksy's stencils feature striking and humorous images occasionally combined with slogans. The message is usually anti-war, anti-capitalist or anti-establishment. Subjects often include rats, apes, policemen, soldiers, children, and the elderly. Banksy's first film, "Exit Through the Gift Shop" made its debut at the 2010 Sundance Film Festival. In January 2011, he was nominated for the Academy Award for Best Documentary for the film. In 2014, he was awarded Person of the Year at the 2014 Webby Awards.