"University of Westminster graduate Matthew Chamberlain has designed a sustainable treehouse to provide starter homes on London's streets, while also tackling the city's high pollution levels.
The Street Tree Pods are teardrop-shaped structures made from wood, designed to merge with existing or new trees. Taking
up the same amount of space as a single car-parking bay, each structure
would offer short-term accommodation to a single occupant."
More at Dezeen