Which characteristic best describes the Prairie School architecture?

The characteristic that best describes Prairie School architecture is its low projections emphasizing horizontality. This style, developed primarily in the early 20th century and associated with architects like Frank Lloyd Wright, is known for its integration with the landscape and the use of horizontal lines. The design is often characterized by low-roofed buildings that blend into the flat terrain of the American Midwest, creating a sense of harmony with nature.

The emphasis on horizontal lines not only reflects the surrounding environment but also creates a feeling of stability and groundedness. This design principle contrasts with more vertical styles found in other architectural movements, which often prioritize height and ornate features. In Prairie School architecture, the focus is on open interiors and the flow of space, further enhancing its distinctive horizontal orientation.