The Toilet-shaped house is an unique architecture creation of Sim Jae-Duck to mark the 2007 inaugural meeting of the World Toilet Association. The two-story 4,520-square-foot home is made of steel, concrete and glass. It features a showcase, glass-walled bathroom at it’s center. Those concerned with privacy can turn the walls opaque at the touch of a button. The home also features a roof-top balcony that’s accessible by a staircase and equipped with rainwater harvesting technology.