A contest sponsored by Lightspeed and CloudAhoy is inspiring general aviation pilots to draw in the sky. Contestants make line drawings using the path of their airplanes, recorded using CloudAhoy, a smartphone based GPS flight tracking app. The concept, on a larger scale, was popularized in the last few years by jet aircraft manufacturers who used the extremely long flights required for certification, particularly ETOPS testing, to sketch out a shape with their radar track.
Source: avwebAerial Artistry on Display