It's a little random. It's very cool. It's Jared Ficklin's interactive art project that takes Stephen Hawking's Cambridge Lectures and then uses an algorithm to turn the physicist's words into stars. The video pretty much explains all that you need to know. I should only add two things. 1.) Ficklin is one of the speakers at the big TED show this week, and 2.) it looks like you can snag The Cambridge Lectures (or pretty much any book you want) as a free audio download from Audible.com if you sign up for their 14 day, no-strings-attached, free trial. Get more details on that here.