Wow... two hundred and fifty Canon 60Ds make up this light animation:
Video directed by Masashi Kawamura + Qanta Shimizu + Masatsugu Nagasoe -- cool but, why do they need the cameras?... surely you can fire the flash alone with a sync cord. The songs a bit shit as well (IMO) -- Bright Siren by Androp.
Behind the scenes video of how it was done: