George Ancona, whose photography has documented children’s activism in Can We Help? and It’s Our Garden, turns his camera and his straightforward, documentary-style text on an extraordinary annual performance at the National Dance Institute of New Mexico. More than 500 schoolchildren come together to perform 20 dances based on children’s books, each with artful costuming and expressive choreography that leaps from the page. The elaborate preparations in local school gymnasiums are recounted alongside a quieter story of four boys who are pulled from their classes for extra training. From pas de deux to stage fighting, this is what Boys Dancing (Candlewick, $16.99) looks like. Ages 6-9.