It enters the world as a flat sheet of paper that you can post to someone (should you feel overcome by the urge), but once placed into hot water it becomes all bendy. Then you can open it out into its vase shape, cool it down in cold water and suddenly you’ve got a solid, waterproof vase. Once you’re done with it, you can run it under the hot tap once again and it will revert back to its flat shape.
Handy for if you like flowers – you could store all your unused vases in a nice little pile. 🙂