A fluid artwork that reflects the real world, Viégas and Wattenberg's "Wind Map" constantly alters its meaning, purpose, aesthetic, and conveyed emotion. It displays the continuous wind patterns flowing across the United States, measured between one, three, five, 10, 15 and 30 mile per hour increments, using data from the National Digital Forecast Database that is updated hourly. The result is a rich and visually impressive image that combines nature and technology. Hint.FM honors the invisible source of energy that surrounds us with the entrancing perpetual motion of simple lines on a map.