One of the classic architecture residential master pieces is Frank Lloyd Wright’s Fallingwater house, a mountain retreat, a house that doesn’t even appear to stand on solid ground, but instead stretches out over a waterfall. It was designed in 1935 in rural southwestern Pennsylvania (Bear Run Nature Reserve) for Kaufmann family. Fallingwater redefines the relationship between man, architecture, and nature. It was built with 4 materials: sandstone, reinforced concrete, steel and glass. Wright used a semi – circle to allows a tree to grow through the trellis near Fallinwater’s front door. Rock cuts in the fireplace physically brings waterfall in the house.