The Japanese are well known for their efficient use of small spaces. The Nakagin Capsule Tower in Tokyo is one of the best futuristic examples. It was designed to give a glimpse of life in the 21st century when delivered in 1972. The tower became the last of its kind completed in the world. None of the original capsules have ever been replaced, even though architect Kurokawa intended a lifespan of only 25 years.