Which house is considered the "First Prairie House" designed by Frank Lloyd Wright?

The Winslow House is considered the "First Prairie House" designed by Frank Lloyd Wright. This residence, completed in 1893 for the businessman William Winslow, exemplifies the early characteristics of Wright’s Prairie style, distinguished by its horizontal lines, integration with the landscape, and use of natural materials. It represents a shift from the traditional Victorian homes of the time, embodying a more organic relationship with the environment. The design reflects the early principles of the Prairie School, emphasizing simplicity and a sense of harmony with the surrounding landscape, which would become signatures of Wright's later work.

The other houses listed, while significant in their own right, do not hold the historical distinction of being the first Prairie House. The Robbie House, for example, is an iconic work by Wright that was completed later in 1908 and showcases more developed characteristics of the Prairie style. The Kaufmann House, famously associated with the desert architecture of Palm Springs, was designed by Richard Neutra and is not attributed to Wright at all. Lastly, the Wright House lacks a specific identification in architectural history, making it less relevant to the question at hand. Therefore, Winslow House stands out as the foundational example of the Prairie movement in Wright's extensive body of work.