Protest art is a broad term that refers to creative works that concern or are produced by activists and social movements. There are also contemporary and historical works and currents of thought that can be characterized in this way. Social movements produce such works as the signs, banners, posters, and other printed materials used to convey a particular cause or message. Often, such art is used as part of demonstrations or acts of civil disobedience. These works tend to be ephemeral, characterized by their portability and disposability, and are frequently not authored or owned by any one person. The various peace symbols, and the raised fist are two examples that highlight the democratic ownership of these signs. Protest art also includes (but is not limited to) performance, site-specific installations, graffiti and street art, and crosses the boundaries of art genres, media, and disciplines. While some protest art is associated with trained and professional artists, an extensive knowledge of art is not required to take part in protest art. Protest artists frequently bypass the art-world institutions and commercial gallery system in an attempt to reach a wider audience. Furthermore, protest art is not limited to one region or country, but is rather a method that is used around the world. For example, Publixtheatre Caravan is an international theatre troupe that creates critical performances in everyday spaces around the world.There are many politically charged pieces of fine art — such as Picasso‘s Guernica, some of Norman Carlberg‘sVietnam war-era work, or Susan Crile‘s images of torture at Abu Ghraib.