The problems that you might have with a Stretch Shelf start with the realization that you need storage space for something more than a couple of books.
So you try and stretch out the rubber band to accommodate more stuff. If you're lucky, you might just ruin the wall. If not, you or a loved one could end up shopping for glass eyes and funeral homes. Thankfully, the Stretch Shelf is only a concept at the moment. [Pete Oyler via Designboom]