SpontaneousInterventions: design actions for the common good is the theme of the U.S. Pavilion at the 13th International Venice Architecture Biennale (Fall 2012). In recent years, there has been a nascent movement of designers acting on their own initiative to solve problematic urban situations, creating new opportunities and amenities for the public. Provisional, improvisational, guerrilla, unsolicited, tactical, temporary, informal, DIY, unplanned, participatory, opensource—these are just a few of the words that have been used to describe this growing body of work.