For 10 points, name this Pennsylvania home built partially over a waterfall, one of the best-known works of Frank Lloyd Wright.
During this building's construction, Robert Mosher was relieved of his supervising position after this building's steel reinforcement was doubled without its architect's consent. An early proposal for this building called for its concrete to be covered in gold leaf. Built near Bear Run for department store magnate Edgar Kaufmann, it uses cantilevered floors in order to extend part of the house over a running creek. For 10 points, name this Pennsylvania home built partially over a waterfall, one of the best-known works of Frank Lloyd Wright.
During this building's construction, Robert Mosher was relieved of his supervising position after this building's steel reinforcement was doubled without its architect's consent.
{Fallingwater} [accept {Kauffman house} before “{Kauffman}” is read]