There are numerous ways in which people make illegal or unauthorized alterations to urban space. This video provides an overview of a study that identifies and analyzes one that has been largely ignored in social science: explicitly functional and civic-minded informal contributions that I call "do-it-yourself urban design." The research, which began as an investigation into more "traditional" nonpermissable alterations, uncovered these cases—from homemade bike lanes and street signs to guerrilla gardens an
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