The designation Prairie is due to the dominant horizontality of the majority of Prairie style buildings, which echoes the wide, flat, treeless expanses of the mid-Western United States. The most famous proponent of the style, Frank Lloyd Wright, promoted an idea of "organic architecture" (p. 53), the primary tenet of which was that a structure should look as if it naturally grew from the site. In the words of Wright, buildings that appeared as if they were "married to the ground." (p. 53) Wright also felt that a horizontal orientation was a distinctly American design motif, in that the younger country had much more open, undeveloped land than found in most older and highly urbanized European nations.