ocr: Stone Fallingwater was built upon the very boulder upon which Wright's client loved tos sit and contemplate the waterfall and the beauty of the surrounding woods. The massive sandstone chimney from which the house cantilevers is anchored into the boulder and is laid up like the naturally occurring stone ledges. But the design goes even further: It invites the boulder to enter into the house by having itp protrude through the floor atthe very point wherei itcan form the heart h for theliving room fireplace. The boulder itselfbecomes the heart of the house.