'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 canvas

Henry 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 reveal secret US military bases - and also referred to as GPS art or GPX - your movements are the paint and a city block your brush stroke. Think of them as 21st century digital geoglyphs.