Largest sky writing message

On 12 September 2012, artist ISHKY, aka Ben Davies, along with Stamen Design (both USA) launched Pi in the Sky, an art installation that utilized a team of five synchronized sky writers to create the first 1,000 numbers of pi – literally in the sky – using dot-matrix technology. The attempt took place across the San Francisco Bay Area, USA, with each digit measuring approximately 402 m (1,318 ft) in height and the total message stretching across 161 km (100 miles), making it the largest sky-written message. Moments after each digit was written, its specific shape was lost, so the piece gradually dissolved into a visual anomaly that provided a point of curious discussion for spectators in the area. From the artist's point of view the installation "explores the boundaries of scale, public space, impermanence, and the relationship between Earth and the physical universe". A sixth plane flew above the sky writing team to document the whole event.