What started as a popular gymnastics exercise in Germany has become a crowd-pleasing act for Cirque du Soleil. Six-and-a-half feet in diameter, the wheel consists of two metal hoops joined at six points. Identical twin brothers turn and spin the wheels while performing gravity-defying somersaults and acrobatics. Though both were featured in Cirque du Soleil’s Nouvelle Expérience, this is the first time they are performing together as a duo.