When Design Goes Too Far
Here's an image that's been making the rounds today. It's a bed that breaks down into four pieces that can then be interlocked with the floating bookshelves to form some sort of padded wall/bookshelf.
It's just a design concept and not meant to be produced (I hope), but even so it's quite a case of a design looking for a problem. A few shelves on the wall will have a lot more storage for books and you can then store a futon or an inflatable mattress underneath.
And do you really want your mattress displayed on the wall?