Pi in the Sky

[1][2][3][4][5][6][7] The numbers, each 0.4 kilometres (0.25 mi)[8] high, were created by a group of five[9] skywriting airplanes, and appeared as a dot matrix.

[3] The string of numbers was produced in a large loop 161 kilometres (100 mi)[8] in circumference, at an altitude of approximately 10,000 feet (3,000 m).

[5] The aircraft used were 1979 Grumman AA-5B Tigers, small, single-engined planes provided by the company AirSign Aerial Advertising, based in Williston, FL.

The numbers were produced by spraying natural, burnt-off canola oil,[10] which dissipated, causing no environmental damage.

[13] The 2014 display was part of an ongoing project, directed by artist ISHKY (Ben Davis), and again involved AirSign Aerial Advertising.

Numbers as they appeared several minutes after being written in the sky.