I just watched this video by Muto

which is The new short film by Blu an ambiguous animation painted on public walls.
Made in Buenos Aires and in Baden (fantoche)

it is also wonderfully ambitious, playful and gets your head going... trying to work out how they did it in 3d space! stunning

MUTO a wall-painted animation by BLU from blu on Vimeo.

They actually have done many graffiti type art installations on walls, buidlings arounf the world. Always in this simple, yet beautiful style.