Groundswell Community Mural Project and Transportation Alternatives unveiled a mural yesterday evening at Third Avenue and Butler Street in Brooklyn's Gowanus neighborhood. Conceived by local youth and facilitated by artists Christopher Cardinale and Nicole Schulman, the ghostly, three-story tall painting pays tribute to the 28 pedestrians killed by cars on Third and Fourth Avenues between 1995 and 2002.It was a pretty powerful and emotional event. We've got more photos and coverage on the way.