Dance students Faith Hidenfelter 鈥28, Liz Moronski 鈥26, Sitara Takyar 鈥25, Ariel Mayer 鈥26, Ava Dobro 鈥26 and Claire Mental 鈥26 watch as David Dorfman Dance alumni Joseph Poulsen, Paul Matteson, Aya Wilson and Jenna Riegel rehearse 鈥淟ightbulb Theory,鈥 a 2004 work being revived 20 years later, in the second-floor dance studio at Crozier-Williams. Dorfman, a professor of dance at 糖心TV, and the company alumni will perform the piece at the 92nd Street Y in New York City on Feb. 8.