So when I was in Kindergarden or early grade school there were books you were encouraged to borrow and read. I rembember this one book where the pictures are done in a way that they are different if the book is rightside up or upside down. There was writing on the top and bottom of the page so you read the book one way and it tells a story. When you get to the "end" of the book, you flip it "upside down" and now the pics are different and the text tells a whole new story. I rembember a few pics: one was a scene of a city outline like where you have all the rectangular building shapes next to each other that was something different when the book was upside down. Another was a pic of a steam locomotive leaving a trail of smoke in the sky. I think when that one was upside down, the smoke plumes were puddles of water or something. Hopefully someone on here knows....