If you dig this, please also see the work of Kumi Yamashita, who does similar shadow artwork with letters and shapes, but in real life.
http://kumiyamashita.com/
some stuff is super hard to believe, like:
http://kumiyamashita.com/images/BUILDING-BLOCKS-FOR-WEB.jpg
other artists working in this genre too:
http://www.designer-daily.com/remarkable-shadow-art-405
