Really Fun Library Slide - Architect Moon Hoon designed the Panorama House in South Korea, which features a multi-functional library. A wooden slide (used by the adults in the home, too!) is flanked by stair step bookcases.
The hanging Spirals staircase. This design makes sweeping under the stairs easy! A hanging double spiral staircase is part of the Didden Village project in Rotterdam. There are two such staircases; the other is a single spiral.