Dancing cows? Tea parties on the ceiling? Talking birds? Christmas shopping with stars? When Mary Poppins is about, her young charges can never tell where the real world merges into make-believe. Neither can the reader, and that is one of the hallmarks of good fantasy. And the comprehension guide is full of as many interesting things as Poppins' carpet bag: poetry, crafts, mazes, and even directions for a proper cup of tea.