First there was the Accordian CD Holder from DWR. Now the same idea is writ large, with Scheren-Regal, foldable shelves from Swiss designer Kurt Thut. We don't know which idea came first, but Thut's shelves are part of a line which also includes a foldable bed, so clearly this guy has transport on the brain. What's next? George Jetson's folding car comes to mind. It would certainly be useful here in San Francisco. In the meantime, these shelves seem perfect for someone who accumulates books over time. They expand with your mind. More info here. Available in the States here.