I'm not sure where you stand on graffiti. I think that it can either be a wonderful art form or senseless vandalism for the sake of letting people know that 'gary woz ere'.
One of the main arguments against it is the 'defacement of property' angle and yeah, that's fair enough. You might not like a sprawling mural depicting anti-capitalism if it was sprayed on the side of your bungalow. However, this is not a criticism that can be levelled at 'light graffiti'. However, the capacity to make impressive works of art is still there. It's by no means a new idea. People have been doing it for a while. It was the basis of a pretty sweet Music Video back in 2003, for example. But people are still finding new ways to dazzle us with its possibilities.
Case in point, the work of Freddie Wong who has used the technique to make this short film: Light Warfare. As you can probably tell from the screenshot below, it's pretty spectacular.
Watch to the end for a link to a 'behind the scenes' video as well. Sweet!