There are many graffiti masquerading as "urban art" in defacing street signs, but this true artwork by Colombian artist Andrea Acosta is something else: her artwork is on "the b-side" of the signs!
Part of the "Life Goes Public / 10 Public Art Interventions to Update Paula Modersohn-Becker in Worpswede," to commemorate the 100th year anniversary of the death of painter Paula Modersohn-Becker.
Link - via Wooster Collective