Next time your friends complain about lack of space in their apartment, point them to this ultra-compact stairwell dwelling completed by H2O Architects in France, June 2007. Built for the families teenager, the 12 sqm. house has four split-levels and is an exercise in extreme storage solutions.
While you probably spend more time on the steps then actually in a room, the house offers a place to sleep, work, live and wash--meals are taken inside with mum's cooking. Perfect.