I saw this brilliant little article on 70s Japanese capsule apartments, this weekend, source here.
Photographer Noritaki Minami documented the Nakagin Capsule Tower, of 1972, in this superb series of images. Each apartment offered 'micro-living', being just over 100 square feet each.
The photos are recent however - and perhaps reveal a tension between the ideal the architects felt offered residents, versus the reality of contemporary life. You can see the whole series here.