Blu is a street artist from Argentina. He's taken graffiti to a whole new level, creating animations on walls and sidewalks. His latest is Muto which is both a technical tour de force and an eye-opening creepy animation.

Not only did he work in the less than ideal environment of the sidewalk, but it meant that he couldn't have more than one frame in existence at a time, with no possibility of reworking old frames or sketching out new ones. Once the frame was shot, the work was destroyed. Amazing.