I published a photobook 'Danchi Dreams' in 2018 that captured the massive Japanese apartment blocks from the same era as Nakagin. The apartment buildings, known as 'danchi', were constructed from the 1960s - 1980s to replace burnt-out cities and house a booming population. Though they might not be quite as spectacular as what the Metabolists dreamed up I think they shared a forward-looking vision for what the modern world could be. http://danchi-dreams.com/