We never expected this. While magnet fishing, our magnet latched onto something heavy and it turned out to be a locked safe. What we found inside completely blew our minds. You won’t believe this one.

Read all of Slate’s stories about the 25 Greatest Picture Books of the Past 25 Years. On Oct. 8, 2010, the New York Times ran a story on its front page: “Picture Books No Longer a Staple for Children.