If you were among the millions of people that watched NBC’s replay of the opening ceremony of the 2018 Winter Olympics in PyeongChang, South Korea on Friday, February 9, you might have seen an airborne snowboarder, a bird flapping its wings, and the iconic Olympic Rings light up the skies. While they may have appeared to be digital fireworks, the mesmerizing show was the result of thousands of tiny drones preprogrammed to follow complicated flight paths to form the shape-shifting images.