Every surface in the world is a cloak-and-dagger canvas for Mr. Brainwash's franchise of the mind. In 2006 Mr. Brainwash set aside his video camera and quickly became renowned in the burgeoning street art scene alongside Banksy, Shepard Fairey and Invader. Brought to wider attention by Banksy's 2010 documentary film Exit Through the Gift Shop, Mr. Brainwash's massive solo art shows have attracted hundreds of thousands of visitors globally and his...