Nano House ($23) contains 40 examples of ingenious, responsible and advanced homes that each have less that 650 sq ft of living space. Housing is becoming a real problem due to lack of space. In growing cities space is at a premium due to new businesses whereas out in the country we are doing our best to preserve both nature and the landscape. In the world’s most impoverished areas economical and sustainable living is a necessity and something we rarely think of in this digital age until we are in the position where we have the basic human need for a roof over our heads. This is a fascinating look at how we can fulfill this need by having a living space that is efficient, ecological and flexible.