Size: About 79 sq. ft.

Location: Weil am Rhein, Germany

Best known for Manhattan's New York Times Building, London's The Shard, and Paris' Pompidou Museum, Renzo Piano is now turning his attention to tiny details — specifically, to "Diogene," a tiny house prototype built for German furniture company Vitra.

The house — which is constructed of wood and aluminum paneling, and collects, cleans, and reuses water — also supplies its own power, and features photovoltaic cells and solar modules, a rainwater tank, a biological toilet, and natural ventilation.