Spending Time With Poster Boy

Found this video on youtube on a guy known as Poster Boy, he uses nothing but a razor to cut up subway posters and adds them t other posters to create a different, I know it's classed as vandalism but it's very well done and it's original, more of his work can be found here, http://www.flickr.com/photos/26296445@N05/ and here is his youtube account http://www.youtube.com/user/PosterboyNYC