A humorous introduction of philosophy and object permanence, with an interactive format: gatefolds engage readers and prompt children to think beyond what they can immediately see. What happens to all the things that we lose or let go? The balloon that floats off into the sky, the sock that slides behind the radiator, the bucket swallowed by waves or our shadows when the sun goes down? In the unique style of French graphic designer Delphine Chedru, this book encourages the early reader to imagine all sorts of items that have disappeared out of sight.