With a whirl of spins, soaring jumps and fluttering hands, this high energy composition for eight dancers is a feast of virtuoso dancing. Four fast-spinning couples open the ballet to Von Biber’s music, a prelude to the perpetual motion ahead. A medley of spirited selections from Vivaldi concertos sets the racing pace for the rest of the ballet, featuring a series of dazzling feats, split-second flying leaps and catches, and challenging footwork that shows off the tremendous range and agility of the dancers. On first hearing the Vivaldi score featuring two violins, choreographer Jorma Elo recalls he felt “It was extreme playing on the edge of madness.” The dancers bring this intensity to life. “They’re very fierce,” Elo says. “They have this kind of fearlessness connected to the music.”