As a dancer, Lynn Parkerson performed in traditional productions of The Nutcracker. Now the founding artistic director of Brooklyn Ballet is adding technology to the classic holiday show, with help from Brooklyn-based hacker collective NYC Resistor. Network engineer Nick Vermeer, wearables wiz Olivia Barr, and computer securities expert Billie Ward collaborated on LED-enhanced costumes that light up in response to dancers' motion. On tutus, the effect is evocative of falling snow. And for the ballet's mysterious Drosselmeyer character, the team created the "Pexel" shirt, which adds a touch of magic with lights that sync to the dancer's muscles.