That’s not a slick photoshop job
Nope, residents in the Bay Area could actually look up at the sky on September 12 and see pi, written out to 1000 digits, printed by 5 planes. The project, called Pi in the Sky, was undertaken by ISHKY, a group of artists, scientists, and programmers with the goal of exploring ”the boundaries of scale, public space, impermanence, and the relationship between Earth and the physical universe.” Just to prove it to you, here’s some live video of the digits being printed (sky written? sky printed? skrinted?) in real time:
What’s amazing to me is how fast the skrinting goes - any clue how they do it?