A William Forsythe triple threat, including two PNB premiers, presents distinctive works from a dance maker legendary for his radical inventiveness. Forsythe achieves perfect neo-classical form in 'The Vertiginous Thrill of Exactitude, a dizzy delight of refined technique and crystalling pointe work. A sampler of duets, individually re-worked for PNB. New Suite's mltiple pairings articulate a diversity of forms as well as matters between the sexes.