Silk-screened placard with twine. Silk-screened placard with twine. At 12 noon Saturday, September 22, 2001, ten days after 911, over 100 artists all wearing black filed onto Union Square. A hush fell over the crowd as they took their places in a semi-circle. For one hour they stood in silence wearing face masks and the placards. By that evening the image was seen around the world. Condition: excellent. Condition excellent.