Hong Kong is so expensive that architects are building 100-square-foot 'tube homes' made from concrete water pipes

For the past seven years, Hong Kong has held the title of the world's priciest city for home-buyers, according to the 2017 Demographia International Housing Affordability Survey.

James Law, a Hong Kong-based architect, believes that his micro-homes could help alleviate the city's housing crisis. But his tiny home designs are anything but typical - they are concrete water pipes outfitted with all the amenities of a modern home.

Law explains more about his "tube home" design below.