Via Metafilter: three dimensional street paintings. Really pretty and amazing.
The only point I was thinking of that these paintings should only be seen from one direction: if you think about it, how would the shadowing work anyways? Conveniently, the painter took the pictures from the direction those paintings have to be seen from, so he’s actually a bit cheating. Nonetheless, as said above, it takes a painter to make these kind of paintings.