Amazing 3D street paintings/chalk-art

I seem to be on a trend with the 3D art here...

So here are some more mind-boggling, three-dimensional pictures, most of them done by anonymous artists. All of these are drawn on the street, or some other public place. Obviously (or not so obviously), these are all, in reality, completely two-dimensional.

Street paintings:
                       
                 (Click images for slideshow and/or better viewing)

Chalk art:

                                                          

                                                                 - Images from Design Swan