Alex Teplitzky writes: “Although The New York Public Library for the Performing Arts has one of the largest collections of performing arts assets in the world, there aren’t many children’s books in the archives. One book about cats does stand out, though–a book about one cat, in particular, named Mourka.” Mourka belonged to ballet choreographer George Balanchine, and “Mourka, the book, is full of images of Balanchine’s cat’s ability to leap and glide through the air like a ballerina.”