The long front wall of the guest wing has embedded in it a number of steel posts covered with lath and cement plaster painted to merge with the concrete. Typically, Wright was not concerned to express the skeletal structure but rather to build expediently, achieving a harmonious whole that was understandable but not explicit.... In the very area of the living room, the metal framework of the glazing membrane is extended far beyond the glass; the horizontal bars mutate into shelves that wrap around the interior corner and curve out to meet a stone wall. This play of horizontals distracts attention from the anomalous wall treatment and strongly ties the corner elements together.
- Edgar Kaufmann, Jr.,
Fallingwater: A Frank Lloyd Wright Country House, p. 114.