The Klein bottle is a mathematical surface with no distinct “inner” and “outer” sides. Mathematical surfaces and shapes like the Klein Bottle intrigue architects because they provide new possible constructions and ways of communication. Klein Bottle House is an example of architecture inspired by these structures. The architects have successfully created a vacation home which messes with your brain but - nevertheless - is warm and inviting. Therefor, it doesn’t come as a surprise that this house won the award of best home of 2009, at the World Architecture Festival.