Urban art pushes boundaries as one of the 21st century's most subversive artistic expressions. Street artists like Banksy, KAWS, Mr. Brainwash, and Shepard Fairey create innovative graffiti, toys, ...

As part of its ongoing "Art for All" ethos ... A few weeks ago an archive of 173 prints, stencils and ephemera from the anonymous graffiti artist Banksy generated about $1.4 million at auction.