Nakagin Capsule Tower in Tokyo was built in 1972 and designed by avant-garde architect Kisho Kurokawa. The building forms part of the Metabolist Movement intended to promote biological processes and served as a prototype for sustainable architecture.
It has 140 removable rooms to allow for easy restoration over time, a first of its kind at the time. The small cube-like spaces measure around 100 square feet and are used for both living and offices. They’re pretty awesome, I personally wouldn’t live in one but I think they’re for an office space. I really like the giant circle window. Here are some different configurations of the interior of the cubes.