Time reported laser graffiti.

Artists James Powderly and Evan Roth recently went on a daring graffiti mission. The goal? Tagging New York’s Brooklyn Bridge. They waited for rush hour to die down and tried to be as incognito as people milling around bridges can be in this post-Sept. 11 world. Then, the duo fixed their crosshairs firmly on the bridge’s underside, and started etching out dozens — maybe hundreds — of tags on one of its massive supports. They held still as a police boat floated under the bridge. Later, they allowed passersby to pick up the equipment and try it for themselves. Yet, the next morning, there was nary a sign that Powderly or Roth — nor their towering graffiti art — had ever been there.