Nendo Designs a House in Japan with Stairs Running Through It www.spoon-tamago.com

The two met in school and have been friends ever since and partners ever since Sato established his design studio Nendo in 1997.
It was roughly 3 years ago when Ito went to Sato with the official request.
For one, the home needed to house 2 familes: his own and his in-laws.
The home is being called Kaidannoie, which means house of stairs.
(photos by Takumi Ota)The parents living quarters (above) and another, more functional staircase (below) that extends through the house.