Concrete ArtTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video06/10/2013June 10, 2013Heiko Zahlmann started out as an underground graffiti artist in Hamburg. Today he's a renowned sculptor. Even the Emir of Qatar has bought one of his concrete artworks.https://p.dw.com/p/18mZjAdvertisement