Michael J. Wallace may start his bike rides in Baltimore, but he ends them on the moon, on a basketball court, or in the mouth of a dragon. He uses the streets of the city as a canvas, sketching out surprisingly detailed images by recording his progress with his phone’s GPS and a tracking program.

Wallace says he didn’t invent GPS tracking art, but he’s the first practitioner I’ve seen and he definitely makes Charm City more charming. Baltimore seems like the perfect place for a deeply weird, home-brewed amateur art form that’s inextricably bound up with the city’s landscape. It is also, some might argue, the perfect place for this:

Way more on Wallace’s WallyGPX site, along with information about how he plots his routes and how long each artwork took.