Light writing is an up-and-coming form of stop motion animation in which still images captured using the technique known as light painting or light drawing are sequenced and so generate an optical illusion of movement for the observer. Pablo Picasso used this technique almost a century ago but it has hit our contemporary consciousness just recently, kicking off with an advertising campaign by an American telecommunications company four years ago.
This particular piece of light writing was created by German artist Lichtfaktor. I think it should be renamed however: with the use of the telephone boxes in the video, surely the piece should be called Starwars V Startrek V Doctorwho!
