Wow! Carol had some of this gentleman's sidewalk art work on her site. I did a Google and came up with this page of his efforts.
He's astounding to me. Take your time studying the pictures. Just click on the title of this post.
His name is Julian Beever and apparently he doesn't stay in one place too long. He's worked in the U.K., Belgium, France, The Netherlands, Germany, the USA and Australia.
Carol's web site is http://shrinkwrappedscream.blogspot.com/ .