Ballets with a Twist is a swizzle stick of a company. Founded in 1996 by Marilyn Klaus, the effervescent troupe is best-known for its Cocktail Hour: The Show, a series of ballets based on classic drinks: Gimlet, Boilermaker, Martini, and more. Recently, due to the surging Delta variant, the company has taken to the rooftop of its Chambers Street studio, where the dancers can perform safely in open space and sky. One of the last dance company’s located in Tribeca, Ballets with a Twist has been here for more than 20 years. Indeed, Klaus was in the building on September 11, 2001. “I heard a terrific crash,” she recalls. “That was the first plane. Upon seeing the explosion from the second plane, I thought we were being attacked, and it was obvious to me that the entire neighborhood was in danger. I grabbed a VHS tape containing the archive of my choreography and ran to the Chambers Street subway station.” Twenty years later, up on the roof, the company has filmed two short dances—toasts to the New York City skyline—Rooftop Champagne and Rooftop Cuba Libre. The Freedom Tower is in the background and the camera work by Emma Huibregtse and her team is elating. So take a moment and float upward, as classical dancers say, en l’air. —L.J.