France is taking affordable passive housing to a new level, and we couldn't be more thrilled. Thanks to a company called PopUp House, building one's own passive home or office is easier than ever before. These solar-powered prefabricated buildings are simply constructed by snapping together insulated wooden blocks and screws, and require no active heating or cooling systems. If you haven't heard of PopUp House, you're in for a real treat. Watch the video below and see this passive house fit together like LEGOs.