'Human etch-a sketch': GPS art, burbing and my attempt to recreate the Guardian masthead

GPS art, or GPX, is a fitness and artistic activity where your movements, traced by GPS signals, become the paint on a city-sized canvasHenry David Thoreau once wrote: “This world is but a canvas to our imagination.” More than 150 years later, a new generation of artists tracing their movements via GPS to create sketches are proving Thoreau’s words remarkably prescient.That’s what Strava art is at its core. Named after the fitness tracking app that has previously helped r