On Friday, September 9th in New York City, Illegal Art installed The Shadow to commemorate the 10th anniversary of 9/11. Starting at the corner of 5th Avenue and 14th Street and heading north for 1,368 feet (417 meters), the height of the tallest of the two towers, we marked in chalk each of the 110 floors of the tallest of the two towers ending just shy of 20th Street.
At the base of each floor we provided a cups filled with pieces of chalk whose total represented the number of people who perished in and around the two towers that day. Passersby were encouraged to walk the length of the height of the buildings and use the chalk to write words of memorial associated with that day. The project remained until the chalk faded away.