Bird-apartment by Nendo

Japanese designers Nendo have built an enormous woodland nesting box with 78 entrances for birds on one side and one big door for humans on the other (+ slideshow). The treehouse was built for observing birds at the Momofuku Ando nature centre in Komoro, in Japan's Nagano Prefecture. People can reach the Bird-apartment by climbing up a ladder and through a circular hole. Spy holes across the back wall of the apartment allow a discreet view into the 78 bird boxes on the other side.