Kurt Wenner is an accomplished artist known mainly as a “master street painter” whose
anamorphic paintings…create a special pictorial geometry that corrects the distortion caused by viewing his monumental images on the pavement from an oblique angle.
His website has a lot of interesting biographical info as well as a gallery of some of his work. I came upon this site from J-Walk Blog and thought his work was very cool. However, I totally forgot that I had already seen his artwork somewhere: Absolut commissioned him to make an ad in 1996 which I now distinctly remember; it can be seen to the right.