Nikisha Fogo and Cavan Conley in a pas de deux from McGregor’s Chroma // © San Francisco Ballet, photo by Lindsey Rallo from its opening night gala . Chroma came packaged with Cool Britannia, a trio of ballets by British choreographers who deconstruct the mechanics of dance, then reimagine them. At SF Ballet’s opening night last week, I learned how Sir Wayne McGregor’s choreography stretched ballet’s physical limits while riding the jagged rhythms of The White Stripes.