To NY-based architect-poets and "reversible destiny" philosophers Arakawa & Gins, comfort deserves only a limited role in the home. In their vision, a home that keeps its inhabitants young and healthy should provide perpetual challenges. A tentative relationship with your environment, they argue, is key to "reversing the downhill course of human life."

This video takes a peek inside their Reversible Destiny Lofts in the Mitaka area of western Tokyo. Designed to stimulate the senses and force inhabitants to use balance, physical strength and imagination, the lofts feature uneven floors, oddly positioned power switches and outlets, walls and surfaces painted a dizzying array of colors, a tiny exit to the balcony, a transparent shower room, irregularly shaped curtainless windows, and more.

For the adventurous, two rental units are now available for 220,000 and 250,000 yen ($2,000/$2,400) per month, which is a bit pricey for Tokyo, but not outrageous. Short-term stays can also be arranged.