Alexander and the Wind-Up Mouse is a Caldecott Honor-winning children's book by Leo Lionni about a real mouse, Alexander, who is jealous of a beloved wind-up toy mouse named Willy, leading him to wish he could be a toy until he realizes the value of his own life and friendship, ultimately using magic to turn Willy into a real mouse so they can be friends together. The book, originally published in 1969, is a gentle fable exploring themes of friendship, longing, and self-acceptance through Lionni's signature collage illustrations.