This issue seeks to explore how designers can intervene in the cities of the 21st century in unconventional and often subversive ways. The layout this year is organized to have both a collection of articles written by leading practitioners, faculty, and students and a catalog section featuring design projects. Themes addressed include historical precedents, questions about the ideology of opposition, and guerilla-style projects that work with issues of gentrification, immigrant workers and the use of public space.