During the Zoo TV Tour in 1992, U2 were trying to create a vision of an attractive future for Europe, as opposed to a negative, dystopian image that would be found in science fiction. With recent and ongoing events in Europe, such as the Revolutions of 1989, the enlargement of the European Union, and the Bosnian War, lead vocalist Bono created a surreal vision of a European location called "Zooropa". Bono has referred to "Zooropa" as being a concept album, with a main theme of the exploration of interpellation within the European Union.