Klein Bottle House – Mornington Peninsula, Australia

This beach house, which was designed by the firm McBride Charles Ryan, was named the world’s best home at the 2009 World Architecture Festival awards. A Klein Bottle is a complex mathematical concept that involves folding a cylinder into itself in order to create an unusual, spiraling form. This notion was the driving force behind the Klein Bottle House, which appears to bring the interior out to the exterior and vice versa. A steel frame was layered with cement and sheet metal, while the architects created a courtyard at the center of the house to allow wind to pass through easily.