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For more info on how they pulled this off check out AirSign's page here
On March 13th, aerial advertising firm AirSign brought artist ISHKY's art to life in a stunning, coordinated performance by 5 pilots who circled the Austin area writing out the numerical representation of Pi. Here are 19 incredible images under the hashtag #PiInTheSky
For more info on how they pulled this off check out AirSign's page here