I caught this image over on Tumblr and, of course, there was no credit for the original artist. Fortunately, with a little sleuthing and a properly credited blog post from Revok1 I was able to unearth the treasure trove of goods from Twin Cities Brightest - a light writing endeavor that trumps just about everything I've seen prior. The official site has a load of examples to browse through but the Flickr photostream is the real onslaught. I'm particularly smitten with the Light Spirographs and the Circle Maker set.. though that's really only the tip of the iceberg, so I suggest you dive right in.