I read the article on this, and the kids response as to why he did it was that his generation has a different concept of privacy, which I thought to be really interesting and probably true.
I think that is from a an experimental art group called the Graffiti Research Lab (GRL). They use home grown engineering to make new graffiti technologies that people can rig up at home, and I think the picture is actually from their new experiment that involves lasers, rather than just flashlights. They are pretty cool, I suggest checking them out.
Keep it classy, Neatorama.