This was done by painting on to a wall similar to that of graffiti. They have used a black out line with white to fill the character/object and then used white paint to cover the previous movement. I really like this piece as you can see the trail of movements behind the object, it looks authentic and not at all computer generated. I also like the different compositions of the animation for example in some shots you can see members of the public walk by as the animation is still moving. Another reason i like this is because i prefer hand rendered animation to computer generate because i believe it is more personal to the artist/animator and you can see the length of work they have gone to to create the piece.
This particular piece was created by an italian artist who uses the name BLU to cover his real identity, there isn't much information about the artist however it is mention he is a street artist (graffiti) who's work can be seen all over the world similar to that of Banksy. His work can be seen in places such as Lima, London, Peru, Berlin, Warsaw and Madrid. Not all of his work is animated the majority of it is still graffiti.
An example of some of Blu's Graffiti work. The piece below was commissioned by the Tate Modern in London.