“He has drawn Godzilla battling Mothra, the lunar landing, the sinking of the Titanic and a horse running at the Preakness. There’s even a rendition of a gun-toting stickup man modeled after Omar, Wallace’s favorite character from the HBO television series ‘The Wire.’ After he finishes each ride, Wallace downloads his route/drawing onto his website, wallygpx.com. It’s a process that he describes as virtual graffiti, because he can express himself freely without defacing publ