The informal code that vagabonds developed in the 19th century to offer warnings and help each other cope with the uncertainties of nomadic life inspired the QR_Hobo_Codes project by Free Art and Technology (F.A.T.) Lab, a Pittsburgh-based research network devoted to enriching the public domain through the development of creative technologies and media. F.A.T. Lab created 100 QR codes (freely downloadable lasercut-ready stencils) to provide advice and warnings to modern-day digital nomads. Codes include “vegans beware,” “hidden cameras,” and “those aren’t women.” QR_Hobo_Codes is one in a suite of what F.A.T. calls its “homebrew infoviz graffiti tools for locative and situated information display.”