** This kind of daringexpanding classical ideals of balance and proportion while affirming themwas one of Balanchine's missions. So was never stinting. "What are you saving yourself for?" he'd challenge a dancer in class. "Do! Now is the time! Relax is for the grave, dear." We hear his voice constantly in a splendid new book. Suki Schorer on Balanchine Technique is more than a lucid illustrated explication of exercises. Through anecdotes, advice, and images remembered from Schorer's years as a company dancer and teacher, it reveals how Balanchine trained dancers to move bigger and faster than one would think possible. Here was a man who was, in a sense, breeding orchidsextreme, unnatural, ravishing bloomsyet he used down-to-earth imagery. The dancers were to perform rond de jambe par terre as if stirring soup; that way they'd remember that the leg should trace a full circle on the floor. Reading Balanchine's ideas on the simplest barreworkand how music affects the performance of ityou understand the gestation of his company's greatness and the vision that made it an instrument not only for his own choreography, but for artists such as Robbins and Tharp.