Hubbard Street Dance Chicago returns with a not-to-be-missed all William Forsythe program. N.N.N.N. appears as a mind in four parts, four dancers in a state of constant, tacit connection. Underscored by the sudden murmured flashes of Thom Willems’ music, Quintett’s seamless progression of solos, duets, and trios for five dancers runs in concert with—and counter to—themes of loss, hope, fear, and joy heard in Gavin Bryars’ 1971 orchestral composition, “Jesus’ Blood Never Failed Me Yet.” One Flat Thing, reproduced begins with a roar: twenty tables, like jagged rafts of ice, fly forward and become the surface, the underground, and the sky inhabited by a ferocious flight of dancers. This pack of bodies rages with alacrity, whipping razor-like in perilous waves. Its score, by composer and longtime Forsythe collaborator Willems, begins quietly before becoming a gale, gathering sonic force as the dancers’ bodies produce a voracious and detailed storm of movement.